I've never been entirely sure how they would/could handle this from a usability point of view. The actual mechanics of having a model with two positions for the hood (for example) would not be too difficult, but making it so that players could switch that position while still leaving it open for later expantion seems like a monsterous undertaking. The only thing I can think of is to absolutely limit it to two position per equipment, then put a toggle next to that gear slot in the equipment menu with corrosponding "/toggle [slot]" commands. But that still feels extremely unweildly to me and not very elegant.