Regarding the prohibition not to wear

B. H.

Peace, Your Honor,

Question regarding the prohibition against wearing a turban: What community's norms should be taken into account? Religious? Secular? Gentile? And from a legal perspective, will there be one accepted norm or is this commandment given in lessons and dependent on local custom?
I would be happy if the rabbi would cite a source or proof for his statement (if he explains it, then at least define it well).
And one more thing on this matter: Some have written (I don't remember right now) that the prohibition was intended to prevent mixing between women and men. Does this reasoning define the prohibition or does it belong to the realm of 'tema dakra' that does not affect halakha?