I know the Armoire's function is to keep special gear: from seasonal events, achievements, the 2.0 Artifact Armor...This suggestion is now to ask about an expansion of the Armoire, so we can keep there another special gear:

* 3.0 and 4.0 Artifact Armor (or at least 4.0, since the 3.0 one is not from quests).
* All Mog Station original gear, like the Moogle's, the ones from the Scions, Edda's... etc.