10. Pi
What you need: plain t-shirt, black paint, little knowledge in mathematics
How to pull it off: For the pi costume, it is simple. You simply paint the pi sign on a shirt. If you don’t pull it off correctly, you’ll come off looking like the guy who forgot about Halloween. Being pi is all about the attitude. When wearing pi, you want to seem creative- not forgetful.
Bonus points: Bonus points if you are able to name the numbers of pi, 3.14159.
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