As a fast change to the Problem with vanity items we have (no space to get more of them) i would suggest, just make the vanity items, chests, legs, boots, aso. 1 Slot Items
So people can store them in Bank / whatever
As i spoke with a dev the other day, you talked about some kind of vanity chest allready, but its not something that will come in the next few days/weeks ... so i suggest just make the vanity items 1 slot items for now, as a fast "fix" to the vanity storage problem we have atm.