viera headgear.

[Iscah]

There's a hat that doesn't obscure hair and literally has our ears just poke through the top given in garlemald msq gear chests for tanks.

I think you're mistaken. The headgear that drops from a Garlean quest is the level 82 pewter coffer, for which the tank headgear is a face-framing circlet/mask thing and not a hat at all. Those have always worked for Viera because they don't affect the hair.