This is funny because they are NOT treated this way.
As in ... Hrothgar can actually show more headgear than Viera cause the devs don't have to deal with the effery that is Viera Ears.
(
Hrothgar get fully face covering buckets that can't visor cause it replaces the head.)
As for your pics, the clipping of Liz horns doesn't hold a candle to the tragic sight that is
Viera wearing hoods.
Besides, we already know why Viera can't wear hats. Their ears are in the "hat" slot so that they can be customized. Unlike cats their ears are not apart of their hair, they can actually change the shape and size of them. Meaning that w/e artistic solution they come up with for "how do you make these ears not look stupid in a hat" would have to be model 4 different times (the 4 different ears they would replace) with different possible sizes.
allow for a solution to hats (As in, make them all have the same ears with zero customization like cats).