Well, I've got one of these that I bought last year on clearance:
Basically it's a generic equivalent to Neo from The Matrix
--only it's fake leather instead of cloth, so it's actually even cooler. (There's a chick version out too).
Although it remains to be seen whether I'll be invited to anything where I can wear it. A former coworker invited me to her and her BF's Halloween party months ago, but one of her other friends is throwing a party so they're going to that instead.
The college is throwing some "Halloween Dance" but that doesn't count as I'm sure it will be lame-o.