I just don't know if I believe that their culture has exactly one garment considered modest.
Venus
That seems like a very disingenuous framing. Khaki pants are no more or less modest than jeans. A rule saying "don't wear this specific article of clothing" is not a rule against dressing modestly, and I'm certain that there are plenty of modestly dressed children of all sorts of cultures at all these schools.
Sincere question. Obviously France is racist as fuck and instituting (or enforcing, whichever) policies in a racist way. But I'm seeing a lot of people saying that these outfits being banned are not actually religious at all, and are only culturally popular within the cultures of the people being targeted. If that's the case, why are they still coming to school wearing them? If I were a kid and the government suddenly decided I'm not allowed to wear blue jeans to school, I'd wear khaki pants and then meet up with my friends and say "wtf is the deal with this new policy"
If they're just clothes and not religious garb, why are kids still wearing them to schools which don't allow them?
Then let the states complain or, better yet, dissolve the fuckers
I haven't yet seen evidence they wouldn't.