I haven't watched anything anime in a while, so I'd likely go as a video game character. More specifically, an NCR Veteran Ranger without the helmet, because I fucking hate helmets. Riot/bulletproof vest with neck protector, riot gloves, combat boots, jeans, a few belts and/or ammo holders, and a duster. Paint the vest and duster a bit, and voila.
I do actually plan on doing this someday. If I have it all before next December, which I should, it'll also be my apocalypse outfit.