Never up to the students. The school just changed the rules. Follow the rules or change schools. Focus on education, go to college, go to law school, and get the law changed.
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What's the problem? Dress codes typically provide that you have to wear appropriate clothing. No tube tops or mesh athletic shirts or short shorts or messages on T-shirts that condone violence or drugs; no clothes that tend to distract from an orderly educational environment conducive to doing schoolwork. Is there some reason you are unable to comply with a dress code of that nature?
Yes they can do this.
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