Ripping off if toonsrule's thread, what is your favorite clothes on men. Granted, men's bodies and clothing doesn't offer the variety that women's do, at least not without crossdressing.
Masculine men. Let's save femboys and such for another thread.

I like em with dress shirts, partially buttoned. Low rise pants.

active camouflage
so i can't see them

Leather jackets with the tassles on the arms. Also work clothes, I think the idea of a man coming home from work to see me is romantic. Except silly outfits i can't think of more, (silly being like a suit of armour)

A dick sword made from the gods of genitalius!

Honestly anything that fits well looks good on a more-or-less attractive guy. You'd be surprised (or not) how many men wear clothes that just don't fit and accordingly end up looking sloppy and unattractive.

Pajama pants!

Formal wear, or fancy clothing. But only cause it getting dirty and them reacting to it is adorable