For Halloween of 2016, I wanted to create my own costume, something that would stand out. My wife and her friends all got animal onesies to wear for a night on the town, so I figured I'd join them, but with my own twist.
I bought a Pikachu onesie and picked up a couple of neopixel rings. I wired up the rings to an Arduino nano board and programmed a series of light patterns that the nano would loop through.
My wife then helped me sew the rings onto the costume, and Pika Cheeks was born!
I powered the setup using a USB battery pack that I kept in my pocket. The costume was a success, and lots of folks out on the street told me they liked it!