Hmm.. I don't know, I think official classic clothes like suits, official jackets, coats and similar things are beautiful. ^-^ Sometimes I wish I was a guy to try them on (lol don't judge xD), but they are just so large.
Some sporty clothes can be cool too.
I generally prefer black and white clothes with dominant black color on guys.
I don't know how to describe them, but I wish my guy, if he wanted cool clothes yet he was clueless, would let me shop for him & choose his clothes by myself huhu~ :P