You can't put Resshi Attire in the Armoire.

[Avatre]

They've stated there is limited space in the Armoire. I think there would be backlash if they chose to use it for cash shop items rather than in game obtainable items.

Question, why would there be backlash for items that if lost you have to pay MORE money for rather than items that you run the dungeon/raid/treasure maps a couple times to get the stuff to either make it, or the item itself? I would honestly say there would be more joy than anger over making it so Mogstation items could go in armoire.