Yeah I've had WoW where they came up with their own solution of storage for transmog. There are ways around it, but considering how they've been over increasing the size of things like vault space or bounty slots, I don't see that being near the top of their list. Though as they are introducing the blueprint and shader terminals perhaps they could do one for your gear, but it'd be quite big if you consider all the different weapons, armours, cloaks etc that there are in the game.