Originally Posted by
Raikai
The answer for this, theorized by people who must have been modding the game, is that this instance of headgear works because it doesn't show any hair - at all.
And to this, is pointed that it's actually a hair problem, as in... Viera, both male and female, have no "hat friendly" versions of their exclusive hairstyles.
That's no excuse, though... They only have 9 exclusive styles each gender, so is not like it's a ton of work. Given that some hat friendly variations are made by simply omitting parts of its structure.
Bear in mind that there's also a third issue of some "tall" headgear clipping horribly with Viera ears displayed. But those would be the exceptions, I suppose.