Glamour slots/plates to be increased.

[Pixiehawk]

You can only re-buy the items that are attached to the achievement. That means the accessories and shield (I'm pretty sure the shield is one) cannot be replaced after the event ends. And if you aren't able to equip the items because of level and thus not get the achievement, then you won't be able to replace any of it. The Garo stuff needs to be able to be stored in the armoire.

Reread the notes again. It specifically says "Gear you have previously earned can still be obtained from the Calamity Salvager after Patch 5.1"

You can't complete the quest after 5.1, but you can re obtain the gear you've earned.