Sweat shops are horrible places where kids are abused. No one should be forced to wear something that was made in one. School uniforms should not be forced on people because they do not allow for creative expression or individualism. They make you part of a collective . No no no.
Children should never be forced to do anything--whether in the context of school uniform or anything else. The topic of sweatshops is a separate one and can be addressed in and of itself, regardless of the age of its products consumers. Countries like the US outsource products for the obvious financial gain.