Preorder Sonic Colors for the Nintendo DS or Wii from GameStop, and you get this hat.
I'm not sure I can live without this hat. I know it won't come close to fitting my ridiculously over-sized head. It's probably for the best. I'd just wear it all the time, everywhere I went. I might have even bought red shoes to go with the outfit, leaving me just a blue plush outfit away from being a full-on hedgehog furry.
No, I'll probably just display it proudly on the plastic head that came with my Modern Warfare 2 night vision goggles. It's better that way.