Imagine a teacher at a public school, or a Centre de santé et des services sociaux receptionist. If she tucks her hair into a turban as a fashion statement, or dons a headscarf to keep her hairdo safe from the rain, or because she's having a bad hair day, that would be perfectly acceptable. Ditto for covering a pate denuded by cancer chemotherapy. But if she puts on that same headscarf out of Islamic modesty, das ist verboten.