I didn't really wear anything this year (except for normal clothes -- most con organizers frown upon outright nudity!). I'm looking to build an outfit for future conventions, that I can do without having to sew because I don't have the slightest clue how. I flunked Home Ec in sixth grade, what can I say?
Some of the things I want to assemble it with are impossible to find. Or even impossible to use -- like a seven-foot-long or so necktie (how would you even knot the thing?). Finding something really retro in the way of a jacket, and then putting custom embroidery on one of the lapels, is also probably going to cost more than I can spend. (I'm thinking of something a 1980s New Wave singer would wear).
Those are really the only two pieces that would have to be costumey or customized.
There is nobody specific in anime that I am aware of that someone of my age and/or build could dress as.