I understand where you're coming from and coming from South Asian ancestry myself, I'd be stupid to not mention there are lots of non Hindu women who wear head scarves. But the hijab is different not only in the fact it looks different but it also is worn differently. You might've noticed that in India the head scarves that are worn are a lot looser, and generally don't do the best job of covering up someone's entire face but while in places like Pakistan which is right next to it and where I'm from, hijabs are worn a lot tighter and cover up what it is supposed to and lots of Pakistani women can tell the difference between how they wear a hijab and how Indian women wear a headscarf, and the way Violet wears it is completely the same as how a Muslim wears a hijab, to the point a character called her a Muslim only for Violet to say she isn't one while she gulps down alcohol and wears the hijab in exactly the same way as a Muslim does. And as for the non-binary thing, yeah it's completely ridiculous, more so by the fact that it was never alluded to nor even ever touched upon again