There doesn't seem to be rhyme or reason as to why some outfit pieces just let the tails or ears clip through and which ones will prune them off your character.

I would much rather just let the tail and ears clip through than be removed personally if they can't take the time to make them work for each race individually like they used to. I mean...they used to make special versions of hats with ear holes for the races that needed them, but sadly those days are long gone unless it's a relic gear set usually.

Also any race that plays SCH or RPR and uses Seraphism / Enshroud loses their ears and tails when they get forced into the white angel robe or hooded avatar transformation.
I probably shouldn't even bring up how poor Viera and Hrothgar characters are still waiting just to wear most hats.