Introduction: Optimus Prime Costume

Picture of Optimus Prime Costume

When first beginning my search for the most AWESOME Halloween costume ever created, I first wanted to pick something I've always loved... this lead to my childhood amore for Transformers which eventually became my Magnus Opus or Optimus Prime to be exact. Once I had the idea I shared it with my family and thus began the endless nights, thousands of Glue gun burns and my invasion occupation of my living room. I unshackled the little geek in me and let him run buck wild 'til his heart's delight.

All together I spent about $40 - $50 bucks, finding most materials from what I had in my garage or around the home.

Things you'll need:
- Hot Glue Gun (and sticks - the bigger the bag the better)
- Duct Tape (Red, Gray)
- Masking Tap (Mainly for paint)
- Small Ruler and Big Ruler
- Exacto Blade
- Scissors
- Spray Paints (Primer, Red, Blue, white and Mettalic)
- $.99 cents store Mini Flashlights (4 of them)
- Hard HAt (about $6.00 at any Hardware Store)
- Velcro (Found at Major stores like Target, Kmart etc.)
- Lots and lots of cardboard, or foam board. Most companies throw out scrap or just go to your local markets and ask them to save you some before tossing.
- 2 tin cans (emptied of course)
- 2 plastic report sheet covers (for the windshields)
- I used old Hockey Gloves but any cheap canvas ones will work.
- Packaging tubes or PVC piping

Over the last month I've found myself staring at piles of trash while driving, hoping to find something I can use for my costume. Always try to be frugal and inventive.

Step 1: Creating the Head

Picture of Creating the Head

Let start with the head.

First select an old bicycle, snowboarding, or hardhat helmet that you never plan on using again.

From the Cardboard or foamboard
- Cut 2 ear flaps (Triangle shape)
- Cut 1 center unit piece (Retangle Shape)
- Cut 2 side discs where you plan on attaching the 2 antennae. (circle discs) Antennae.

Like most of this project it will be a series of trial and error to make things fit, the ear flaps are no exception. Once you have your desired shapes cut out, you'll need to cut circles on the inside to affix to the helmet with hot glue. Adjust fast because the glue dries quick.

The Center unit will present the biggest challenge as the concave center will need to be cut out with your best estimate then refitted for additional cuts. Remember don't over guess because you can always take off more, but you can't regrow once cut. Take your time on this fitting, it will pay off in the end.

Finally as for the side discs, just cut out 4 identical round discs, then for interior spacing take small scraps of cardboard and stack them like pancakes. Identical in number so both discs are even. Sandwich the small scraps with 2 discs and glue in place. Wrap then glue with out rim with a thin strip that covers the sandwich space. While drying cut out 2 long strips which will be the antannae (equal length) then measure out there width on the strip part of the disc. Cut slats on the discs just big enough to fit the antannae then put some glue on the tips and insert in the hold. Attach to the outer flaps and you've got an Optimus helmet.

Prepare for Painting by taping open areas of fabric with masking tape and any plastic bags around the home. Primer first, then paint over with the blue color of your liking.

Step 2:

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The Grill was made from Foam board found at any Target, Kmart and many times are at CVS or RiteAid stores. It comes in big sheets of 36" x 24" and is pretty inexpensive. (You'll maybe need 2 sheets for the entire project, more if you're prone to recuts)

I cut out a cross shape on it about the size of a regular sheet of paper (8" x 11-1/2") then folded and hot glued the edges together. Again the better your measurements and cuts in the beginning the better your final project will look.

I cut 1 center line the same length as the longest side (11-1/2") and hot glued it to the center.

I then measured and cut out 16 equal slats, slight taller than the interior depth because I planned on slanting them. Carefully I glued each slat into place, visually trying to adjust them to the same angle slant. (Trust me your hands become more skilled as you do this.)

Luckily foam board doesn't require primer as it is almost alwasys ready for paint.

Step 3: The Chest Piece

Picture of The Chest Piece

Basically it's trial and error for sizing.

Take a box, slide it over your body like a sock and guess how much needs to be cut to fit perfectly around your chest without counting your arms into the space. Cut out 2 big holes on the sides and try it on again. Most times your guess will be spot and won't need redoing.

Cut a vertical opening in the back so you can enter and exit easily.

Close off the top and cut out a big head hole. (Cut it a little larger than your head so your shoulder/neck muscles will fit through it better. (You may notice that while a box is perfectly happy to have all 90 degree angles, our shoulders aren't built that way. The have a little bit of a downward "V" shape)

Duct tape all interior bends. This reinforcement will become invaluable as you work the suit and tears begin to reveal themselves.

Step 4: Adding Comfort and Detail to Chest

Picture of Adding Comfort and Detail to Chest

The opening on the back has an additional interior overlaping flap that I used to affix velcro straps to. Kinda like putting 1 hand over the other.

I put 2 strips and tried sewing them in for reinforcement but found the needles couldn't hold up so I hot glued them. If you can get any sewing in I recommend it highly as sometimes the glue tends to rip off the first layer of cardboard.

Here I've added an awning flap where I plan on putting the small flashlights I bought at the 99 cents store.

Step 5: Painting the Chest Piece

Picture of Painting the Chest Piece

It will become invaluable for you to set up an area outside your home where you will perform all your painting. Not only will it find itself being used all the time, but it's a good place to allow things to dry while your working on other parts.

Here I've set up the chest piece and small flashlights for paint. (Apple red of course)

Try to save your paint by knowing ahead of time what will be showing and what will be covered by other parts. As you can see i didn't paint the front slats in the chest piece becuase I knew I would addint windshield pieces later.

Conserving your paint with bring the dollar value on your expenditures down, so don't paint the inside please; that would just be ridiculous.

Step 6: Chest Piece Detail and Flare

Picture of Chest Piece Detail and Flare

Once the chest piece paint is dry, I hot glued the flashlights into place and used an extra amount of glue for reinforcement.

*word to the wise, if paint is not completely dry, the hot glue will melt the paint and make the bond weak, meaning a.) You'll have to repaint, and b.) Your glue won't stick. So wait until it's dry for sure.

I cut out 2 windshield slats to slide into the chest openings then paint them sky blue. The lighting bolts you see were cut out of regular white print paper then Elmers glued into place. I then took 2 plastic sheets found on those report covers I used to hand in to school, and cut then glued them over the blue sky and lighting bolts. This will give you that glass reflective look without actually have glass.

Hot glue them into the covering and if you want create an outer frame for them by painting metalic foam board strips and hot glueing them to the outer edges.

As you may also notice I painted the bottom of the fram metalic by masking off the top portion with tape and plastic bags found around the house.

*Side note: Notice Spaceballs is on the TV in the background!

Step 7: Torso Coming Together

Picture of Torso Coming Together

I spent a lot of time refitting to make sure things work well. I put all 3 parts together.

I kept the lower torso separate from the upper chest portion and similar to the chest piece I opened up the back of the lower torso and used velcro as the clasp. Think of it as a girdle of sorts. adjusting to whatever weight or body types needed. It's pretty much a box that's open on top and bottom. I double walled this torso because I knew it would have to survive multiple attempts at sitting.

I made it slightly thinner than the upper torso so it could slide into it when I sit down, like an accordion. I also added a pair of suspendors to the inside to help with the weight and to keep it from sliding down.

Step 8: My Two Left Feet

Picture of My Two Left Feet

To create the feet I took an old pair of shoes and and old industrial floor mat. (Like the ones store cashiers or chefs use) and stacked them on top of each other.

- Decide on how big you want the feet and create the box+trapazoid design you want.
- Cut out 8 to 12 pieces out of the foam and hot glue together on a pancake stack.
- Save just enough foam for the top layer where you will trace out a silouette of the bottom of your sneaker.
- You will cut out that silouette and put the shoe in. This will keep your shoe from sliding back and forth inside.
- Hot glue a velcro strap around all the foam pieces so that it meets just above the shoe. This will hold the shoe down into the silouette and give you more stability.
- Now build the shell around the foot and for added strength, insert some screws into the foam through the cardboard.
- When you paint make sure the shoes aren't inside the boxes!

Step 9: Creating the Legs

Picture of Creating the Legs

Boxes unfortunately do not come in pyramid form so you'll have to enlist your old Geometry skills for this one. Luckily you can skip the Pythagoreum Theorum on it.

Measure the length of your leg and go about 4 to 5 inches above the knee. Remember you can always cut away more, but your can't regrow cardboard.

Add strength and durability to the pieces by affixing duct tape to the interior bends. Again this will help with tears.

Fit the bottom opening to the feet and cut as needed. Double wall whenever time, energy and cardboard allow. It will help in the long run, but it does make the outfit a little heavier.

Step 10: Getting Them Feet to Dance

Picture of Getting Them Feet to Dance

Once you get the right fit for the leg to foot balance, how to do keep everthing from slopping around?

I added velcro strap to the top of the legs that attach just behind the knee. With the lower half hugging the outside of the feet and the top half held against my knee you'll find it very stable and comfortable.

I also began making the design for the front of the lower leg where the vents will be places.

Step 11: Completing the Lower Leg & Paint

Picture of Completing the Lower Leg & Paint

I found an old 4x4 razor scooter in my garage and decided the wheels would make great tires for the side of the legs. You should be able to use an old Big Trike or broken kids toys to use as wheels. (I don't recommend taking them from a toy that's still being used as this might upset the previous owners)

If you can't find any, and need to create some. Then see step 1 about creating discs. Same procedure different paint.

For Gas Cannisters I used old Tin Cans and painted them the same metalic as the other parts.

*Special note: Bolt these wheels and tin can to the leg piece. Just using glue is not enough. They will be knocked off. Make sure you use washers whenever bolting anything to cardboard. This will held secure it better by not punching holes in your creation.

Use the same technique for creating front vents that you used for creating the stomach grill. Foamboard works great.

Step 12: New Helmet Needed

Picture of New Helmet Needed

After working with and mastering the materials I felt a new Optimus head was needed. The old one was too heavy, too hot and looked like a melon head on top of an already growing upper torso. I felt like a school mascot. So I scrapped it and re-did it from scrap.

I purchased a HArd Hat at home depot for $7 bucks, pulled off the straps (becuase they raise the helmet off your head too much and hot glued some padding in it, I ripped off an old bicycle helmet.

the reuslts were much, much better.

I made the sides thinnner and reused the side flaps and antannae from the first helmet. I recommend this one instead of using a snowboard helmet!

The face shield was cut then painted metalic to match the other parts of the costume. It's removable and held in place by 2 small pieces of velcro on the inside. I plan on purchasing a pair of blue tinted sun glasses to wear underneath as I've already got severe tunnel vision in this helmet and don't need to further reduce my line of sight.

Don't forget... PRIMER THEN PAINT!!! IT'S A MUST!!!

Step 13: Almost Finished

Picture of Almost Finished

Once all the parts were completed I began the comforting process. This means like a wedding dress, I fit then recut and repaste and added duct tape for reinforcement.

The arms are basically 3 boxes.

- The shoulders were originally loose but then I decided the weight was too much and they began to sag (droopy optimus) so I attached them to the chest piece, which made it difficult to get in and out of, so I made the front of them flaps that open up like garage doors. When not open they're held shut by 2 small pieces of velcro straps on each interior side. Unless someone undoes them, they hold pretty well. (Hot glue of course)

- The exhaust pipes are from onld packaging material. Fabric stores have these and toss them. The're thicker than toilet rolls and stronger than Bounty roll tubes. I recommend they be sturdy as I plan on having them tugged at all night long on Halloween. They, like the tires on the legs, are bolted on. Again to prevent shearing. The holes are painted on using label stickers. I firts painted the lower half black. Waited for it to dry; placed the stickers evenly apart, then painted over them with the metalic spray paint. after drying I simple peeled off the stickers carefully with a pair of tweezers. You'll notice I shaded the tops to make them appear used.

Step 14: Arms & Side Wheels

Picture of Arms & Side Wheels

You'll notice the side hip wheels were added to hide my backside as I plan on wearing tights Halloween night. Since cardboard is not very breathable, being able to wear underwear will help me keep the heat off. OF course they are bolted on for strength.

The waist piece is just some rubber foam matting I found at Target for $1.24 in the clearance section. I added the raised yellow pieces by cutting them out and wrapping them in bright yellow duct tape.

The thigh pieces both open in the back and are free standing. They have overlaping velcro closures and are reinforced by straps I found on an old baby front back pack. The velcro wasn't enough, as they would open when I tried to sit, so adding these straps was very helpful in keeping them closed. The design is just lines and dots, although I did add some shading on the outside to make it look more industrial.

As for the Arms, I was lucky that my Garage Junk included a Polycentric Hinge that I used to stabilize the upper and lower arms. See the attached design to help you visualize how the arms were created. Let me know if you have any more questions on the arms and some of the small details.

Step 15:

Picture of

The final piece was deciding on what gloves to wear. At first I had a canvas pair that were already blue. You might have see them in the background of some of the other pictures. But ultimately I decided that an old pair of hockey gloves would be best.

They look more robotic, have more padding so the cardboard doesn't dig into your wrist and just fit the overall dimensions of the suit better.

Unfortunately the material does not lend itself to being painted, so I had to apply about 6 coats becuase each one kept being absorbed over and over again until finally it held. I have no remedy of this, just some advise to make you you save an entire paint can for just this.

Step 16:

Picture of

If I look tired in this picture it's because I am. I've lost so much sleep and some nights I didn't even sleep at all. This was last Sunday 10/19/08 where I've been up for about 36 hours... but I finished it!

Now If only can remember where my bed is. It's been so long that I might have trouble finding it.

Step 17:

Picture of

Two things you'll need to plan on are:

1.) Your home is going to be an absolute mess. If your wife has problems with little messes, then she's going to freak out and problably going to want a divorce before this is over. Try and clean up as you go along. It will definitely get knee deep in trash. Also cover any important wood you'll be working on with layers of extra cardboard. You'll be digging into it with your Xacto knife if you're not careful.

2.) Set an area aside in your home where you can place the completed pieces. Preferably out of foot traffic or where the dog will pee on it. This costume takes up a lot of space so make sure you don't damage your hard work. Also pre-plan how and where you intend to store the costume once completed. Luckily I have a garage and lots of packing material. If your single it could become permanent art in your room, but if you have a girlfriend or spouse these things are not possible, as they will clash with the Pottery Barn theme she is working toward.

All in all I have to say it's been one of the most rewarding expiriences. Lot's of time and love went into it. I hope you can find or commit the same amount when creating yours. I leave you with 3 bits of advice:

1.) Learn the interior fold for cleaner lines.
2.) Duct tape all bends for reinforcement
3.) Learn to work on 3 to 4 hours of sleep a night.

Godspeed and good luck


thebeatjackson (author)2010-08-07

Thanks for the great instructable!

tacosmith (author)2009-11-10

My three year old wanted to be Optimus prime for halloween so I had to scale the costume down quite a bit. Thanks for the good design Idea!! He loved it and the family was impressed with what you can do with some cardboard and a bunch of hot glue:)

jtigermask13 (author)tacosmith2009-11-11

Tacosmith, great job, especially since it had to be scaled down tremendously...really awesome. 

ЕвгенийР14 made it! (author)2017-04-05

Hello Friend! I made this costume for a carnival! I'll go skiing in it! =) Thank you very much for the instruction! I live in Russia, in Siberia. Come to visit! =)

LuT4 made it! (author)2016-10-30

It was awesome using the ideas from this page and making changes to fit my sons size. It was a fun build and he's a happy kid.

CaptHollis (author)2015-10-28

I really want to make this for Halloween of 2016. Before I do, though, do you have any estimation as to its total height for, say, a 6' tall male? I need to be able to fit through doors, both vertically and horizontally.

scaruthers made it! (author)2015-10-26

This was a great build. Had a lot of fun with it already and Halloween is still a week away. I made a few slight modifications here and there but primarily to the helmet so my face would be hidden using drywall repair screens so I could see through but no one else could see in. Thanks for the details on the build!

AieshaD made it! (author)2015-09-27

My nephew wanted to be Optimus Prime for Halloween 2 years ago and we followed these instructions. We adjusted of course where needed because he was only four at the time, but the costume came out great! We have made his costume every year since this one. Thank you so much for the detailed instructions.

SilverWolf149 made it! (author)2015-09-21

Thanks for inspiring me in making an awesome costume. I had an idea and searched it up and was directed to your Instructable. I made a costume of my favorite Transformer, Silverbolt. I added LEDs though, just to make it coolsies. You can look at the project here

CraftybrosephBW (author)2015-09-05

that's awesome!

68marcopolo (author)2015-06-22

Dannyeurena, I think it's our duty to remind you how awesome your instructible still is and probably always will be! Many many thanks!

alphanumeric3 made it! (author)2015-05-27

i found this instructable back in 2010. very helpful thank you!!!

jessie.frank.90 (author)2015-05-06

I know what I'm doing this year for Halloween, I don't care how old I am this is cool and I want to give it a shot

josborne1 made it! (author)2014-11-09

Best costume for prime i have seen yet, thanks for the inspiration. Made a hot rodimus costume the year after i made my prime, then made my girlfriend a bumblebee for this year. Have won multiple contests since making them! thanks for the help and inspiration!

amylarsonpearson made it! (author)2014-11-04

Thank you for taking the trouble to post this! 4 years later it was perfect for me and my boy!

V3nom0us (author)2014-11-02

Just wanted to pop in and say that there are still people using this to make Prime. Mine will be used at comic con and is still not 100%. i've got a lot of detail to add, but decided to take it for a spin at a Halloween party, a costume contest, and to hand out candy to kids this weekend. He was a huge hit, and I actually got a standing ovation when I walked out for the costume contest. It has taken me roughly two and a half weeks so far and will probably take another week to finish up.

gilber_corrales made it! (author)2014-10-31

The costume we made for our three year old son. A workweek.

AtomixWolf (author)2014-10-29


audra.morgan.7 (author)2014-10-29

That is awesome! You did a great job

courtney.cusson1 (author)2014-10-25

Me and my Dad are making an Optimus Prime costume for Halloween. This helped a bunch!

bfalk33 (author)2014-09-30

I decided last year I wanted to be Optimus for Halloween (they were my favorite toys as a kid) so I found your instructions and set to work. I showed my 5 yr old nephew the plans and he decided he wanted to be that too! I had my work cut out for me. I didn't get it done as well as I would have liked as I ran out of time, but it was still fun and he was a hit at school and in the neighborhood! This year I am going to put some time into it to make it easier to walk and re-use it! cardboard, duct tape and hot glue gun was a success overall!! and pretty inexpensive. A million thank yous from us both for your great ideas and plans!!!

jwu1981 made it! (author)2014-09-25

We made one according to your design, thanks for sharing:)

dickyboy1102 made it! (author)2014-09-09

thanks for the inspiration.made prime for mcm comic con scotland.cheers

Kumarinspired made it! (author)2014-06-15

Thank you very much for the instructions - it short cut the learning process immensely. Not only did it inspire me, it kept me busy while I was in the transition for looking for work. I wore it at Supanova 2014 in Sydney yesterday and it brought so many smiles, it has further inspired me to be able to one day create my own future instructable! This amazing drawing was what I based my costume on, it took me every night for 6 weeks - a great challenge but well worth it.

Doctronic (author)2011-06-22

Greeting Dannyeurena,

I took on the challange of doing my own Prime using our Prime as a blue print. I wore it last weekend for our pop culture expo, Supanova in Sydney, Australia. I could only wear it for a short time but when I did have it on, I could not move without everyone stopping me for a pic.

Took me over 2 1/2 months to make and had to cram in the time in the end to get it done. Still needs a bit of work done but the result was epic!!

Thanks for the blue prints. Without them I don't think I would of got this done. The pic's are a shorten pic history. Enjoy.

That's awesome, this helped me a little. what did you put in the leg to keep it on you shin? foam board?

Know its a bit late replying.... 2 years I think. lol! But I used thick foam on the legs and let it 'hug' the leg and prayed that gravity didn't take over. If I was to build it again, I think I would of used a different method.

Eireannach made it! (author)2014-02-20

Awesome instructions!

cbeatty1 (author)2013-11-20

Thanks for the inspiration, made my first Optimus costume, and blaster! This was a lot of cardboard carving , let me tell ya! And it's true glue gun burns freakin hurt! Lol!! But just wanted to say thanks for the pics and the info, made my Halloween fun!

smcshinsky (author)2013-11-04

Thanks for the great instructions. I had a blast making this.

aday11 (author)2013-11-01

I just want to say thank you so much for posting this awesome picture.. As you can see I made Optimus for my son who is almost 7. I didnt use any of the diagrams, etc.. I just went by looking at the picture of the finished product. And He won Best Handmade Costume this year. And If it wouldnt of been for the main picture you posted, I dont believe it would ever of come out as good as it did.. You had great detail, and all the right things. Again Thank you. Hearing him say "I Love it sooooo Much, Thank you, you are the Best Mommy ever" was worth all the time invested. Which was around 100 or so hours. Next year he wants to be an excavater.... LOL

Zerofi (author)2013-11-01

Another one.... thanks for the tips and inspiration.

bwoolard (author)2013-10-06

I'm wanting to build one. Where do I find the patterns? I can't find them anywhere

ablec1 (author)2013-09-26

trying to build one now. Thanks for this build. Iam going to also build my son a halloween costume! I love G1 Prime!!!!

jeffphares (author)2013-07-30

Just wanted to say great job! I'm starting on one myself. I'm making my out of EVA foam and it's going to have a war "weathered" look to it. You did a fantastic job man!

Jollytime71 (author)2012-12-10

Ahh, so after a month of building, I was able to make this. I can't tell you how many pictures I took with people. It's SO awesome and fun to walk around in. With the added height of the feet and helmet, I stood just under 7' tall. And I took my little cousin trick 'r treating in it.

kfh99m (author)Jollytime712013-05-07

I like the suit. How did you make the gun?

DoorstopLex (author)2012-11-03

Just wanted to thank you for this fantastic Instructable. I took on your design and with but a few added touches of my own won first price at a Halloween party. People loved it and I have you to thank.
Unfortunately it wasn't finished, still needed a few touches here and there, but still went down a great hit.

Thanks again!

ybravo2 (author)2012-11-02

Thank you for taking the time to share all of your hard work with the rest of us. My 9 year old loved his costume so much! Thanks again :)

Eireannach (author)2012-11-02

Awesome instructions! Took me every weekend for 2 months but I finally finished. Here is my Optimus!

Miketimus Prime (author)2012-03-27

HEY!!!!! IM DONE. well almost! YOU ARE AWESOME!!! hey yesterday I went outside with optimus and a man walks up to me saying that he wants to endorse the product!! If you want ill give you his number!!

Miketimus Prime (author)2012-02-08

This is my Optimus prime costume so far!!

Miketimus Prime (author)2012-02-07

Hey I have been trying to make a Tranformers suit ever sense I was a very little boy! Thanks to you I can FINALLY fulfill my childhood dream. question how did you keep the legs (shins & thighs) to stay on? I am having a little trouble

Fireflyjunction (author)2012-01-26

Thank you so much for posting this! I made my own Optimus costume based on yours, with a few adjustments for being a girl and having a different... torso shape. My work has a four night Halloween party type thing for little kids and I ended up wearing it four hours each night, mobbed by kids and several adults the entire time.
Just a warning for other Primes-to-be out there: I did have a problem with several of the kids thinking I was a Real Steel robot and trying to get me to fight by hitting or kicking me. The parents usually told them to stop but after a while I had to find a buddy to try and stop them before they got close enough to hit. (For most of them you can tell which ones are going to hit you but they're really smart about coming in from your blind sides.) After spending hours and hours working on this costume it was extremely frustrating having it get banged and torn up. Be sure and bring along repair supplies if there's going to be kids around.

Team3313 (author)2012-01-24

I'm a guy from a robotics team and we're making this as our mascot. Helmet was easy but we're havin' trouble with the body.

Tips would be nice


Anything that you could give us so that we can have an easier time building it. Thanks man, your great.

lexkeepsitsimple (author)2012-01-20

What if you used real mirrors on the chest instead of painting the mirror effect? I never actually watched transformers when I was a little girl, but this looks awesome... but I am assuming that those squares on the chest are mirrors or something?

Team3313mechatronics (author)2012-01-18

Upon looking at your design I was wondering if you had demensions to follow at all?

psmarie (author)2011-10-31

Thank you soooo much for making this instructable! You totally made my halloween. We had sooo many people compliment us on it.  I made this costume for my 4 year old who LOVES Transformers right now. I spent a month (off and on) working on it (probably could've finished it in a week but it was a busy month), anyway, last night (10/30) he says
"ummmm, mommy, I think I want to be a Decepticon instead..." Honestly! The little monster. LOL.
Once he put it on though, he was so psyched to be Optimus. I think he was just yanking my chain.
Here's a pic of our finished product at the end of our night.
I had to make some adjustments to accomodate a child, like making it lighter... waaayyyy lighter.

For the shoes I only made the front halves and had them hinge directly onto the leg, so the shoe and leg were one big piece.

The leg pieces I cut at an angle at the bottom to accomodate a natural stepping motion. Worn with light up shoes it actually added to the costume.

I reinforced the folds on the inside with a finger swipe of caulk and it made the costume super sturdy on the folds.

My windows were cut from an old calendar.

I left out the sides of the torso because it added to much bulk to such a small frame. This really made it easy to slip on and off and because of the arm pieces you can't even tell the sides are missing.

The shoulders are attached with tiny hinges so they move up whenever my son lifts his arms outward.

### One thing I would do differently and something I would recommend for anyone making a costume like this for a small child is to make a template of the entire costume out of a very lightweight cardboard like a cereal box.

Before you glue any of it together, trace and cut out the same pattern out of Foamies (pictured below)
You can find Foamies by the roll (36" by 60") at craft stores like JoAnn Fabrics, Michaels, and Hobby Lobby for about $5 when it's on sale or you use a coupon. Just buy the colors you need for your costume, in this case, red, blue, and white.

With your glue gun, hot glue the foamies pattern ONTO your cereal box template (be sure to score your craft foam the way you would with your cardboard).

Construct the entire costume in the same manner (glue foamies to card then assemble).

Once it's done spray entire costume with a clear glossy spray. 

This will drastically take the weight of the costume down and it will add comfort and squirming room for kids that don't hold still.
I used the above technique on a different project so I know it works, I just wish I could've used it for this costume since cutting cereal boxes is so much easier than cutting stubborn cardboard LOL.

Oh, by the way, the lights on the costume are reading lights from the Dollar Tree. The helmet was started from a camo/soldier helmet also from the dollar tree.

Thanks again for this crazy awesome instructable.

jon.melton (author)2011-10-28

Thanks for the instructions. Here's what we did, Optimus and Megatron. I may post instructions on Megatron later.

chuckmccue (author)2011-10-26

I used a lot of the instructions on this page. It came out great! Thanks!!

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