I think by now Viera should be able to wear any hat

[Bearded]

C'mon SE, even a male Au Ra can wear then and the hat clip everything around the horn, why viera can't do that? Just clip it i think ppl won't mind....

It was stated before the race was available that they would not be able to wear any headgear but some devs worked (for free I assume) behind the scenes to make some headgear available. I doubt this is ever going to change - bunny ears and hats just do not mix.