Introduction: Adventure Time: Finn's Hat + Pattern

Picture of Adventure Time: Finn's Hat + Pattern

The original pattern for this hat was made back when Adventure Time was a short featured on Nickelodeon, and then after it failed to do anything on that network, it made it's way to the internet. This hat is much more like the original "pilot" hat, where it's less of a tube with a face hole. This one has straps that you can tie underneath your chin.

The design for this hat came from my good friend Nate Little. However, he has been caught up in graduate school, and has had seemingly no time to write an Instructable. After months of kindly hinting and nudging him to write one about his hat design, and him never doing so, I simply asked if I could. Obviously, he said yes, and even helped me out. He even let me use his camera while I'm away at college. If you have the time, or like supporting your resident Mad Artisan, check out these links.

Mad Artisan Labs - Facebook
Mad Artisan Labs - Etsy

Step 1: The Pattern + Materials

Picture of The Pattern + Materials

The pattern is attached in PDFs below. When printing them, be sure to not "shrink to fit" or anything like that. The images are sized to 8.5 x11, and need to print in that size or else your pattern will be too small.

Some assembly is required with the pattern. The "Main Flap" piece is divided up into 5 or 6 different pieces and they need to be taped together, but I've made it so there are letters to help you align the pieces.

Once you get the pattern assembled, and ready to go you're going to need to gather some materials.

  • 1 Yard of Fleece (White or off-White)
  • Appropriate colored thread
  • Scissors
  • Pins
  • Sewing machine (optional)
  • Sewing needle (for the ears, or the whole thing)
  • Fabric scissors

Note: Fionna Variation
The only difference between Finn's hat and Fionna's hat is the length of the ears. If you want to make her hat, simply make the ears longer. I didn't include this in the pattern.

Note: Sizing Issues
There have been a few users who have found the final product to be much too large. So if you find yourself having a particularly small head, or perhaps this will be made for a child. It's a good idea to print the pattern at a reduced size. Testing the printed pattern by assembling it and wrapping it around your head is always a good way to make sure it the final product will fit.

Note: Seam Allowance
The seam allowance is very forgiving throughout this project, and mine ranged anywhere from 1/4" - 1/2"

Step 2: Cut It Out

Picture of Cut It Out

You can lay out your pattern, so that you have the least amount of waste, by placing the "Hat Top" in between the "Main Flap." Since you need to cut two of both of these, it's a good idea to fold your fleece in half while you cut.

Here's how many of each part you need.
  • Ear (x4)
  • Main Flap (x2)
  • Hat Top (x2)

Step 3: Sew the Ears

Picture of Sew the Ears

Let's start off easy by sewing the ears. Pin each pair of ear fabric together, and sew around the top edge. Make sure to leave the bottom open.

Step 4: Sew Main Flap + Hat Tops

Picture of Sew Main Flap + Hat Tops

Find both of the "Main Flap" pieces that you cut out. We're going to be sewing up the back edge of each one. Fold a piece in half, then pin the back edge. Try to sew the edge as close as possible, or else you'll have weird lumpy seams sticking into the back of your head when it's all finished. Do the same for the other "Main Flap."

Next we need to pin each "Hat Top" to each "Main Flap." Try to do it evenly, or you may end up with some pleats in your hat (which we don't want). Take your time, and when you think it's good sew the pieces together.

You can give the hat somewhat of a test fit right now. Keep in mind that it's "inside out" and we still need to flip it in a later step.

Step 5: Attach Ears

Picture of Attach Ears

The ears in this picture are a little larger than the one included in the pattern. To make sure the holes you cut are the right size, flip the ears, so they're "right-side out." This is the way we'll be sewing them in. Cut your holes (only on one part of the hat, leave the other alone for now), keeping in mind that there is the seam from the "Main Flap" to act as a marker to the back of the hat.

Once the holes are cut, pin the ears in place. Remember to flip them "right-side out" before pinning them in their respective holes. Now that they're in place use a back stitch (by hand) to secure them.

Flip the whole piece "right-side out" when your done.

Step 6: Final Assembly

Picture of Final Assembly

You should only have two pieces of the hat left now.
  • Main piece with ears (flipped "right-side out")
  • Main piece without ears (flipped "inside out")
Take the piece without ears and place it on the table. Next, take the piece with ears, and put it inside the part you just put on the table. Be sure to line up the back seams. Once you have everything lined up, pin it along the unconnected edge. You'll be sewing it almost completely together, except you need to leave a 2-3 inch gap anywhere on the piece to flip it right side out. I chose the leave a section by the back seam open.

We're almost done!

Step 7: The Flip + Finishing Stitch

Picture of The Flip + Finishing Stitch

Now you need to pull then entire hat through that little hole you left. When you finally get everything through the hole it should look like some kind of weird fleece turkey. Simply push half the hat without ears into the side that has ears, and it's almost done!

You need to seal up the remaining hole with a ladder stitch.

Step 8: Bonus Step! - the Backpack

Picture of Bonus Step! - the Backpack

I was originally planning to do a separate Instructable for the backpack, but decided it was pretty easy to make, and it would be hard for me to accommodate the different sizes of people, and the different functionalities. The one I made in this step is fairly functionless. I still have the option of adding a zipper on top, but don't have one at school (where I made it). Other people might want it to function like it does in the show, as the light green part being a flap that has one large black button.

Either way, if you're interested in making one, you can skip through the pictures, and read some newly added steps(below) and probably get a decent idea of how I did it, and base yours off of that.

1. Cut out the pieces.
  • (x2) 14" circle (one of each color)
  • (x4) 22" x 4" strip (2 of each color)
2. Cut some more...
  • Cut each circle in half.
  • Cut one light green, and one dark green in half, so you will have (x4) 11" x 4" strips, and (x2) 22" x 4 " strips.
3. Start sewing.
  • Fold the smaller 11" strips in half (the long way) and sew along the edge. These will be parts of the straps.
  • Pin each of the long 22" strips to the corresponding colored round edge of the half circle, and sew along that edge.
4. Straps.
  • Flip the 11" strips, so they're "right-side out", and insert each light green tube into each dark green tube, and sew them into place, attaching them to each other.
5. Top piece.
  • Pin the straps onto the remaining half circle (I chose to start with the light green). Next, pin the other half of the light green top to the half circle with the straps you just pinned. Sew along the edge, finishing the top half of the pack.
6. Bottom piece.
  • Do the same for the bottom half. Pin the straps in (making sure they aren't twisted), and sew it up.
7. Finishing.
  • Now we need to sew across the middle of the pack, attaching the light and dark green parts. It's been inside out the whole time, so you need to leave about a 2 inch hole so you can flip the whole pack.
Hopefully those simply written steps and pictures can get you through it.

Step 9: All Done!

Picture of All Done!

Now that you've got the hat, all you need to complete your Finn costume are some blue shorts, blue shirt, green backpack, and a magical yellow dog.

I get comments emailed to me, so if you have any questions, feel free to ask away!

One last thanks to Nate Little at Mad Artisan Labs. Be sure to check out his Etsy store, and become a fan on Facebook.


abigail-nicole made it! (author)2014-10-21

I used this same basic pattern to make a princess bubblegum hat! Might be a little too hat-like (with the flat top) and not wig-like enough, but it works fine for me.

1 yard of pink fleece + 1/2 yard yellow fleece, with plenty leftover on both.

that is so awesome!! my kids want a fin hat so i can here for the pattern and i just so happen to be making my kids a a pretend dress up wardrobe and im so excited to be able to make a fin hat for my boy and a princess bubble gum for my girl! awesome! what about fire princess?! ;)

Great adaptation!

skellytun made it! (author)2014-08-14

Yeah it was a lot large. LOL I'm going to shrink the pattern down to about 80% and use a larger seam allowance. =] FUN THOUGH!

Haha, sorry about that. Great job making it though!

Like I mentioned below, I'll add a note to the pattern step about sizing issues and seam allowance. Sorry for the troubles.

psymenot (author)2013-11-01

This is Finntastic! It took a bit for me to sew it (about 6 hours) because I don't own a sew machine (and it was the first time I sew), but the result is really cool!
It's money-inexpensive (hat: 1.80 euro), and the instructions are really clear!
So, thank you very much! :) here's the result:

Looks great! I'm really impressed you had the patience to sew it by hand, but that just means you'll love it even more!

Stephaniek481 made it! (author)2017-10-24

I’m so glad I found this! Stitched all by hand which was cumbersome, and it’s not perfect, but much better than the store bought version. Thanks!!

LindaR162 (author)2016-12-31

My printer doesn't do "fit to page" or anything like that, so I was surprised to find that the A-B piece (part 2) would not align with the adjoining pieces. Because the hat is symmetrical, I just used the mirror image of the other side.

I'm planning to change the round top to oblong, and I have changed the shape of the back lower edge a bit. All before I even get the fabric out! Photos later...

carolynsp (author)2016-10-30

Where does piece A of the pattern fit into the whole pattern? I'm stumped.

RinRinV made it! (author)2016-02-29

First i want to thank you for sharing the patterns and how to make it! It really came out good! c: Woehoew c:

AllisonP8 made it! (author)2015-10-31

I had to cut off about 2 inches of the height and circumference of the hat for my son and daughter...I am modeling the Fiona hat! I made the backpack from a Pin I found...totally works and will hold Halloween candy

StephanieM53 made it! (author)2015-10-21

Thank you so much for this pattern, it saved me from trying to guess measurements/wing it. Very easy to put together and really good instructions. My 6 year old loves his costume <3.

tvanderwaal made it! (author)2015-10-07

I made this for my daughter to wear at Comic Con. Based in the comments I reduced the pattern initially but I ended up making the hat with the original pattern size and a 1/2" seam allowance anf it fits perfectly. This was a super easy project and my daughter LOVES it. Thank you for sharing this pattern/idea. I used a nice super soft fleece fabric.

claramecium (author)2015-02-10


hlowe (author)2015-01-11

I love this pattern. This is perfect for what I am looking for. I may not be making a Fin hat this time(making a frog hat) This is so awesome. Thank you

mS.AnTiVirUs (author)2014-11-07

Do you have any video on how to assemble the pattern, cuz i really don't get it?

Try checking YouTube for a tutorial if you're having a hard time following this one. There's quite a few to choose from on there.

amanda.lysette (author)2014-11-07

comayzing made it! (author)2014-11-01

Used this pattern with bunny ears instead of "Finn" ears to make a Louise Belcher hat for my daughter's Halloween costume based on the link from this page:

I printed the pattern pages at 90% size for her 11 year old head. It turned out so great and I am a totally non-crafty human. She is in love with it!

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

What time is it? Is time to punch this Halloween in the face! Algebraic! Thanks for this amazing tutorial. I have to admit that is thanks to this tutorial that I have my costume ready and just in time!

Even when the hat resulted a little bit stiff (I used felt... not so recommended) it has an amazing shape! I used a piece of Velcro to adjust the sides of the hat under my chin. And because of my body size I had to cut bigger pieces for the backpack... it's still a little small, so I recommend to measure how wide your back is to get an idea of the diameter of the circles: Don't forget to cut bigger straps, too.

Now, with my own magical dog and my sword, I'm leaving for the land of Ooo...

MatthewB2 (author)2014-10-25

How long would you say is the largest piece end to end. I've read a lot of comments that it fits loosely but I have a rather large head. The circumference of my head is about 26 inches. Will this hat fit with some space?

Sorry for the late reply... Following the pattern directly will be a very snug fit. The largest piece is 25 inches long and that's without any seam allowance. So you'll want to scale up the pattern by about 1 inch, and then just add whatever seam allowance you're comfortable with sewing, while cutting out the pieces.

morgan.turner.104 (author)2014-10-24

I need some serious help!! I am new to sewing by patterns. Normally I only sew crib sheets and bassinet sheets and curtains. Trying to do this for my 16 month old's costume and I am getting really confused.

Sorry for the late reply... Is there any particular step or problem you are running into? I need a more specific question to be of any help.

vic.meza1 (author)2014-10-28

i cant find the PDF links...

They are at the bottom of the of Step 1: The Pattern + Materials

If you can't find that, below are links directly to them:

Part 1

Part 2

Part 3

Part 4

Part 5
tiger.vb.7 (author)2014-10-18

Can you do one with finn's backpack with the pattern too :)

All the measurements and basic instructions are in step 8. It's pretty straightforward, I think you'll be able to figure it out! :)

janice.xuereb.3 (author)2014-09-27

Thank-you so much. Once I converted the measurements to metric, I was fine. Your instructions were excellent and easily understood all the way down under in Melbourne, Australia.

janice.xuereb.3 (author)2014-09-27

Thank-you so much. Once I converted the measurements to metric, I was fine. Your instructions were excellent and easily understood all the way down under in Melbourne, Australia.

furrygurl (author)2014-08-02

I made it and it came out very large

What was the seam allowance supposed to be?

Sorry about that.... It's not actually stated in the Instructable, but what I used was probably somewhere between 1/4' - 1/2." I'll add a note to the pattern step about the sizing issues.

CrystalB01 (author)2014-06-16

total making this i just got a sewing machine and made his sword! great instructable!!!

luckytiger1222 (author)2014-03-07

I can't find the PDF link... ^.^' Sorry if it sounds a little stupid....

It's in Step 1. There are 5 separate pages to download at the bottom of the step, after the images and text.

ptunes (author)LegoBrickMaster72014-04-20

Hi, i can't find the PDF link either... sorry... could you send them to me, please?

LegoBrickMaster7 (author)ptunes2014-04-20

I sent you a personal message with the direct links. :)

criscky (author)LegoBrickMaster72014-04-22

i also can't find the links, can you send me the links?

allycat312 (author)2013-10-21

if you put the right side out piece on the inside of the inside out piece, when you flipped it wouldn't the right side out piece be wrong-side out then? D: I'm confused

The idea is to create a "double layered" hat. Which, once we flip it inside out there won't be any seams showing, and you just need to stitch up a tiny hole.

The tiny hole you leave is the key here. You end up flipping the hat inside out by pulling it through the hole.

It is correct to place the right side out piece on the inside of the inside out piece. This way when we pull it through the hole there will be no seams showing.

Hope that helps. :)

allycat312 (author)2013-10-15

I plan on using this pattern for my Fionna hat I'm making for Halloween but when I printed out the pattern the forehead part looks humongeous! Does it end up looking alright or should I cut it shorter?

There's a few pictures of people wearing it when it's completed, so you can judge for yourself. I would say it's a bit larger than I prefer. I think it almost sits at my brow, rather than a bit above it.

yangmama85 (author)2013-10-07

Hi, I'm making this for my son's (8 years old) Halloween costume and I was just wondering if I needed to make any adjustments in order for the hat to fit his size? Looks like this was more for an adult. Please let me know as soon as you can. Thanks!

You would probably need to shrink down the size.

The easiest way to do this would be to shrink down the PDF when you print it by a certain percentage (probably 80-90%) in the printing options, and then checking the size of the "Main Flap" piece and how it fits around your son's head. I would recommend having about half an inch to an inch of extra paper when you wrap it around his head. Fleece is pretty stretchy.

Hope that helps!

crai-chan (author)2013-06-16

Thank you so much for sharing this ! <3

Sebastians (author)2013-04-08

Thanks man best thing in world!!!!

gwenifae (author)2013-02-04

FYI - I just layed the pattern out on 1/2 yard of fleece and it fits perfectly.


I'll be sure to add this to the materials step when I get a chance.

dnacionales (author)2013-01-25

So is it necessary to have a full yard? or would a half-yard be sufficient? Or would half a yard be enough?

About This Instructable




Bio: The name's Alex. I'm currently majoring in Graphic Design at Cal Poly Pomona. When I'm not busy with schoolwork I like to ... More »
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