I really like the idea of a hooded sweatshirt! I personally don't wear T-shirt with writing on them except to the gym, and the other people at the gym don't really need any additional confirmation that I am a geek :P
Seriously, though, I'd wear a black hooded perlmonk sweatshirt :) I don't know about embroidery, though. I think it might look kind of odd.
--Ivory