Students will always kick against the system, whatever that is. If there is a dress code instead of a uniform, they will try to bend those rules instead. For example, how short a skirt is too short? Are crop-tops allowed? What about hats or hoods which hide the student’s face? Most problems of enforcing uniform rules in the USA are because uniform is voluntary, or students are allowed an opt-out from it. If uniform must be worn by everyone there is much less confusion and enforcing the rules is quicker and simpler.