In the first case, participate in large-scale school activities. This kind of activity is usually held on campus, so students are generally required to wear formal clothes, which must be school uniforms, because leaders used to look neat and look like students. I remember a time when I was a rebellious student. During that time, I hated going to school and didn't like wearing school uniforms. So, I was punished by the dean many times. Just after the sports meeting, the city leaders came. I don't remember it at all. As usual, I wear clothes that I think are fashionable to school. As a result, I met the dean right at the school gate. When he saw me, his face turned blue and he cursed directly: "Don't you know that there will be a sports meeting today?" Are you trying to make me angry? Go home and change. Don't come in without your school uniform! "My home is a little far from school, but I don't want to stand at the door all the time, so I went home and got my school uniform. Later, my classmates learned about it and laughed at me for a long time, so I have been wearing that school uniform since that day except weekends.
In the second case, you can't wear your own school uniform when you go to activities with your parents (such as relatives getting married). You can wear something simple, but if the occasion is more formal, boys can generally choose to wear a suit. If not, you can ask your mother to buy a suit that suits you. Girls can wear skirts or small dresses and spend a little time dressing up, which will generally look better.
Anyway, if middle school students dress up, they are still teenagers, and they don't need to dress up as adults. It's too bright and bright. I think it is generally clean and concise, and it is enough to wear comfortably.