This is not true of every part of islamic culture, but there’s an anti-western focus that is a part of a lot of cultural traditions. The idea for a lot is that if a Kafar (effectively, a sinner/etc) is involved, you shouldn’t be, so that rules out most top tier brands. I’m way out of date because I’m not close to that world anymore, but every once in awhile, you’d see a major player throw something out… Like adidas had a line for a minute that they tried to make a big deal, but I never saw any big brands that you’d recognize in any Islamic shops and I never knew anyone who had even heard that was happening beyond me. Most of the girls I knew stuck to Hijabs which are incredibly simple, it’s basically a four cornered sheet of cloth that you wrap around your head real fancy, so the focus was mostly on type of fabric and patterning, not a lot of room to establish higher tiers of hijabs/etc.

Branding as a whole kind of goes against the concept of the head coverings too.

I’ve no idea. I’m not religious so don’t really know.

I imagine you can get various tiers from cheap -> expensive.