Instructables

Adventure Time! Finn costume! Backpack (functional, with zipper opening) + hat.

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Picture of Adventure Time! Finn costume! Backpack (functional, with zipper opening) + hat.

My kids love Adventure Time. They decided they wanted to be Finn and Jake for Halloween. The cartoon is pretty new and you can't find any Adventure Time stuff in stores so I had to make their costumes from scratch. Here's what I came up with for my boy's Finn costume.
 
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Step 1: Finn's backpack

Picture of Finn's backpack
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For the backpack, find some light and dark green fabric. Felt holds it's shape best. You could also use fleece or cotton.

Cut 2 light green fabric rectangles 12 inches wide by 6 inches long. Cut 2 dark green rectangles 12 inches wide by 10 inches long. Flod these pieces and round the edges.

For the edge of the backpack: Cut one dark green strip 3 inches wide by approximately 29 inches long. Cut one light green strip 3 inches wide by approximately 20 inches long.

For the straps: Cut 2 dark green strip 5 inches wide by approximately 12 inches long (10 inches long if the backpack is for a child). Cut 2 light green strip 5 inches wide by approximately 10 inches long (8 inches long if the backpack is for a child).

Other things you'll need : One 16 inch zipper and one black button and some polyfil stuffing.

Step 2: Finn's backpack

Picture of Finn's backpack
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Sew the dark green edge strip to one of the dark green rounded rectangles 3/8 inch from the edge. Trim any excess.

Sew the light green edge strip to one of the light green rounded rectangles 3/8 inch from the edge. Trim any excess.

Pin and sew the dark green backpack piece to a 16 inch zipper. Next, pin and sew the light green fabric piece to the other side of the zipper.
Why make the hat so long down his neck, it looks very very stupid, trust me, I know everything about adventure time, it's my life.
rezupanda1 year ago
Can anyone tell me how big the inital pieces of light and dark green felt should be? I'm not a crafter so do they sell it by the sheets or by the yard like fabric?
I got 1/2 yard of each, but I had to piece the dark green a bit. If you don't mind leftovers, I'd get a whole yard of the dark. I also made my backpack 2" bigger in both directions. You don't need to make the arm straps bigger though. Just measure your person to see what you need the, to be. The functioning zipper is super cool!
Ok, so you are awesome! I had never put in a zipper before and I followed all of your very clear instructions and was able to make my very own Finn backpack. I made mine a bit larger as my DD is pretty tall. The only thing I had to undo was that I sewed the straps on the wrong side when they really need to be on the right side. Easily fixed and voila! I will tackle the hat tomorrow. I live in Puerto Rico and they don't sell white fleece at any of the stores I've visited, so I may have to use felt. Hope it goes well
ajaco392 years ago
SLAMACOW! THATS SWEET
rigby1232 years ago
i don't really like the hat
ALGEBRAIC!
Carleyy2 years ago
Great Costume. Well done!
MATHEMATICAL! I like your take on the backpack.
That is so cute!