It's called a fitted tee. And the shirtsleeves cut off halfway to the elbow because that's what's supposed to happen when you wear one. The pants aren't that tight, either. I guess you wear your pants really loose, but that looks to about the right fit for a pair of pants.
If it weren't for the hair, which I'll admit is slightly trendy (I say slightly because aside from the color it's really just an average guy's haircut), I probably wouldn't even notice him walking down the street. He looks pretty normal to me.
And how the hell do you "accidentally" go to a Screamo show?