Pupils will be banned from wearing abayas, loose-fitting full-length robes worn by some Muslim women, in France's state-run schools, the education minister has said.
The rule will be applied as soon as the new school year starts on 4 September.
France has a strict ban on religious signs in state schools and government buildings, arguing that they violate secular laws.
Wearing a headscarf has been banned since 2004 in state-run schools.
Religion isn't a choice - you can't choose to believe something. I used to be obsessed with my religion and my relationship to god. Then I had a nervous breakdown, saw a shrink, and was diagnosed with depression and ADHD. Two weeks into taking wellbutrin, ALL CARES about my immortal soul and god and whatever just turned off entirely, like a giant breaker being thrown. It was amazing, and made me realize that people's brain chemistry has as much to do with them being religious as cultural factors.