They do this in Lord of the Rings.
You have a tab that is your main gear for combat and stats etc, but 2 other tabs for dressing up if u like.
Say i pick up a dress that i like, i 'equip' it in 1 of m wardrobe tabs and save it. i can then sell or delete that dress, but still use its appearance :P I thought it was a nifty idea tbh.
Although in wow, i'd need maybe 8-10 of these tabs :P
i wouldnt even object to paying gold for each tab