My argument:
Uniforms encourage unity in school. When we see a sports team, they work together and are unified. There is just a feeling of unity you get when you put on a uniform, it makes you feel like you fit in or belong. If an entire school wears similar clothing or clothing consistent in color and style(uniforms) than they won't feel as ostracized or feel like they don't belong because they look like the other students, they might feel like they are a part of a team.