I agree with people who say there is no need to set any students. I'd just be polite and proper time and place is to wear the student did not develop or are involved with much to learn. So I think the class is able to wear what they have there is no need to set students.
I agree with people who say they don't need to be a school uniform. Just polite, appropriate is tense space and the key is to wear a school uniform is not development study or involved with learning much.