Tho i'm not a hat person most of the time..

[lolnotacat]

He also said that it would happen over the course of Shadowbringers. 5 years later they've not only not made old hats compatible, but new hats are also not compatible and don't have extra geometry to accommodate miqo'te/elezen/lalafell ears.

I'd also like to mention that we're seeing more and more hats clip with Au'ra horns as time goes on.