I was a geek long before it became fashionable-- I make a living in comic book art for cryin' out loud. But the one thing I don't do is wear T-shirts with comic book characters on them-- as a matter of fact I don't wear t-shirts with any design on them. I don't think anybody looks good in them.
All right, so Olivia Munn can pull off the look. And my wife (although I don't think I've ever seen her in one, she is very fashionable). But other than them, I wouldn't attempt it.