Advantages:
1.Every student looks the same.
2.Parents can save money for other more important things.
3.There is no concurention or humiliation between students,if one of them is dressed more poor then the others.
Disadvantages:
1.There is no way to express yourself.
2.You are not able to show your personality through your clothing.
3.It can be uncomfortable.For example in winter you want to wear a warm sweater,because it's cold outside and instead of that you have to wear a white shirt,like everyone does.