> Do you not have students complaining about dress codes in your country?

What does that have to do with anything? Some dress codes are truly stupid, to the point they are literally ignored by both teachers and students. Which is just our chosen way to deal with it, usually. When there is clash, dress code violation is typically seen as something minor, so no reason to protest when you can kinda ignore it.

Frankly, organizing protest is so much work, that kids in your story come across as active people who take governance seriously.