as has been stated uniforms can reinforce the feeling of being in a unit, which is important in an age-group that is generally trying to figure out what kind of individual they want to be/become.
and conformity as boring as it is will allow personalities to be judged more easily than clothes, and might help against possible bullying, although that is not guaranteed
finally it also creates an atmosphere of discipline, something that was severely lacking when i went to school, most young people do not appreciate being educated and how seriously it will effect their future, at least that's how it was in my school and i believe a more serious and disciplined atmosphere might have gotten most of the kids to wise up... myself included, disruptive behavior has a tendency to spread and be emulated much easier than "good" behavior.
i'm not saying that uniforms would solve everything, but there is a reason every military in the world uses uniforms.
and conformity as boring as it is will allow personalities to be judged more easily than clothes, and might help against possible bullying, although that is not guaranteed
finally it also creates an atmosphere of discipline, something that was severely lacking when i went to school, most young people do not appreciate being educated and how seriously it will effect their future, at least that's how it was in my school and i believe a more serious and disciplined atmosphere might have gotten most of the kids to wise up... myself included, disruptive behavior has a tendency to spread and be emulated much easier than "good" behavior.
i'm not saying that uniforms would solve everything, but there is a reason every military in the world uses uniforms.