The ear spikes elezen get on some headgear generally looks ridiculous. I wish the design took into account
  • how people with ears of a given shape would actually get their heads into and out of the headgear,
  • what stress it puts on the ears (some folding is presumably fine, a lot would cause people to avoid the headgear; miqo'te and viera presumably have more mobile ears than elezen and lalafells)
  • the function of the headgear, e.g. helmets should preferably be smooth to deflect attacks, or at least not have the place where the ear meets the head also be the place where a blade is led. Stuff that is for warmth should definitely cover ears (as all the incredulous responses when someone wears a knit cap without actually covering their ears indicate).

E.g. elezen helmets would probably be rather cone-shaped or bulbous to give some room for the ears both when taking the helmet on/off and wearing it, and to actually protect the ears as well. Then again, there are lots of elezen running around in cold climates with their ears out, something that is painful for even us short-eared humans. There is some headgear here that I wouldn't wear as a human precisely because they expose the ears too much.

Viera and miqo'te ear accomodations in helmets would probably also be rather cone-shaped, or maybe long tubes compared to elezen/lalafell domes/squat cones?

I'm also not convinced all races would actually use the same designs for headgear. There probably could be some ears-on-top-of-head designs that ears-on-side-of-head races wouldn't use?