A black shirt, yellow duct tape, some pipe cleaners, and a pair of dollar store wings.
I originally made this costume for Kaboose.com, a site that closed down several years ago, and unfortunately, there is no longer an internet archive of the instructions, and my version of the instructions are long-lost on my old defunct computer.
Basically, add yellow duct tape stripes to a hoodie, then hot glue pom-poms to a couple of chenille stems, then duct tape them to the inside of the hood.
I originally envisioned a black hoodie with a yellow t-shirt over it, but when I started making the costume, I eliminated the yellow t-shirt and just went with yellow duct tape stripes.