No, but they are not 100% free because they can't wear religious clothes.
And into almost every school's rules it's written that they need to wear a "decent attire". But every school has different limits, and sometimes students can't wear a dress, a skirt, a piercing or colored hair... and that's sad. For exemple I seen these tweet today where two girls were almost sanctioned because of their skirts : https://twitter.com/Egni_3/status/1179792066953...
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