We don't have any appearance type abilities in this game. Yeah you can put on costumes, but how often do you come across those? And even t hen you are stuck with the entire set. A HUGE part of liking MMO's is in identifying and liking your character, and that means outfitting him in attire that suits them.
We really need separate appearance slots for at least the armor items. I know dyes are planned, but I'd rather have an appearance slot. Also a dressing room or a way to preview armors would be nice, the icons with the appearance are way too small to discern what the armor looks like and it sucks for bind on equip armor.