Mens fashion largely isn't.
I personally avoid complimenting men because i can't smile in public without getting creeped on¹ but I wouldn't usually because your entire gender shares three god damn outfits. Dress the fuck up. I've had plenty of straight and bi friends, and they all appreciated their guys in historical costumes or cosplay. Just wear the damn cape.
¹i fucking hate all of you for that. Every time I see one kicked in the balls I smile.