Uniforms can help schools. They prevent competition between the students on who has the nicest or trendiest clothes. They help parents save money. In the morning kids won't be rushing to get ready, since they already know what they're wearing.
School uniforms can help kids feel safe. When they go to school without a uniform kids may be offended by what they're wearing and may Ben be violent about it. When wearing a uniform no students have to be afraid about their choice of clothing.