WHY YOU SHOULD SAY "YES"
Some people can judge others by what type of clothes they wear. If someone doesn't wear the current fashion, then they will probably face the problem of being treated unfairly for the entire school year. Also, students might wear inappropriate clothing. Then the principal might have to ban certain types of clothing, which they wouldn't have to do if they required uniforms.
WHY YOU SHOULD SAY "NO"
Who are you? This question can be answered by expressing yourself. One way is clothing. What a kid wears says who they are, and how can they do so if they're wearing clothes the principal made them wear? Also, how can you guarantee that a kid is actually comfortable wearing the uniform? What if it's hot? What if it's itchy or causes blisters? If this is the case, the uniform won't make school days better. It'll make it dreadful!
So now that you know some reasons, what do you think?