So those sets can actually be stored in the armoire. Its an interactable furniture item that some FCs have, but anyone can access one from an Inn room. Only certain sets of gear can be stored in the armoire. The system is set so that anything that can go in the armoire cant go in the dresser. However, if you go to edit a glamour plate it has a menu option and you can switch from dresser items to armoire items. So those are still usable, just stored seperately. Otherwise, you could stash them on a retainer if you preferred.