"one bans ... activities" - To say that banning people from wearing something is 'banning people' rather than banning an activity ('wearing') may be correct in a strictly grammatical sense, I don't know - but, boy, it sure is subtle. Good luck with that one.

I do agree that 'forbidding' would be better, and it has a more menacing connotation, which suits the fascistic law it refers to.