But if they all wear the same school uniforms, they can't...
Students should wear school uniform.
I think students should wear school uniforms. It is because in schools where students are allowed to wear whatever they want, there are school bullies that make fun of other students who may not have a good taste in fashion. But if they all wear the same school uniforms, they can't make fun of one anothers' fashion senses which prevents this type of bullying from happening. And also, if students can wear whatever they want, they might take a longer time to leave their houses for school due to taking too long to choose what they want to wear which may cause them to be late for school.