[Death by Mirrors]

I know there used to be at least one avatar site where you could equip several poses of an item at once when only owning one, and another where you could shadow an item by borrowing it from someone, equipping it, giving it back and as long as you didn't deliberately unequip said item, your avatar would still show it even though it was no longer in your inventory.

Personally I don't mind getting several copies for the poses, even though I consider it funny I actually have to wear three hands to show two.