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.

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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"

Part5.pdf226 KB
Part4.pdf237 KB
Part3.pdf232 KB
Part2.pdf227 KB
Part1.pdf233 KB
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abigail-nicole made it!10 months ago

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.

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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?! ;)

LegoBrickMaster7 (author)  abigail-nicole10 months ago

Great adaptation!

skellytun made it!1 year ago

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!

LegoBrickMaster7 (author)  skellytun1 year ago

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.

psymenot1 year ago
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:
LegoBrickMaster7 (author)  psymenot1 year ago
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!
claramecium6 months ago


hlowe7 months ago

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.AnTiVirUs9 months ago

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

LegoBrickMaster7 (author)  mS.AnTiVirUs9 months ago
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.
comayzing made it!9 months ago

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: http://glitter-mint.blogspot.com/2013/10/costume-i...

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!10 months ago

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...

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MatthewB210 months ago

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?

LegoBrickMaster7 (author)  MatthewB210 months ago

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.

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.meza110 months ago

i cant find the PDF links...

LegoBrickMaster7 (author)  vic.meza110 months ago

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.710 months ago

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

LegoBrickMaster7 (author)  tiger.vb.710 months ago

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

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.

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.

furrygurl1 year ago

I made it and it came out very large

What was the seam allowance supposed to be?

LegoBrickMaster7 (author)  furrygurl1 year ago

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.

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

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.

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

LegoBrickMaster7 (author)  ptunes1 year ago

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

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

allycat3121 year ago
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
LegoBrickMaster7 (author)  allycat3121 year ago
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. :)
allycat3121 year ago
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?
LegoBrickMaster7 (author)  allycat3121 year ago
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.
yangmama851 year ago
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!
LegoBrickMaster7 (author)  yangmama851 year ago
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-chan2 years ago
Thank you so much for sharing this ! <3
Sebastians2 years ago
Thanks man best thing in world!!!!
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