Clothing, or the lack of money to afford current fashions by poorer students, is a distractor from education, and I'm speaking as a veteran of teaching for many years. School uniforms equalize the playing and learning field for many students, and eliminate the constant distractions of inappropriate attire which is pushed to the limits by many students.
As for expressing one's identity, Pink...that should be done in one's educational accomplishments in the school setting, not in one's mode of dress.
Patty