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Back when I was 16 my teacher held me after class and told me that me wearing yoga pants and skinny jeans was a "distraction" his words not mine. To this day this story is an odd source of pride for me. To be fair I couldn't blame him.
I have the unpopular opinion that dress codes are a good thing for a good reason. But the problem is that it gets enforced unfairly (like, by how sexually attracted or threatened adults get). Like your situation, the teacher basically said "Your ass is so 'distracting' in those tight pants I need you to stay right here alone with me after class for a while and keep on 'distracting' me."
But a clearly defined dress code meant to prepare youth for a future where they have to work on professional settings (notice that has nothing to do with "distractions") helps to keep the focus on becoming competent adults. Not on asses and boobs. Most people's future bosses don't give a crap about your self expression and just don't want to deal with complaints from coworkers or customers. I think I got this mindset when I was 14 and worked at a Dairy Queen with a seventy year old crack whore who often paraded around in yoga pants (before they were a thing) meant for 12 year olds and would say things like "I can't wait to go home and get naked." No one there wanted to think about her naked.