The problem with your argument is the poor kids would...
Should their be school uniforms
The problem with your argument is the poor kids would still be bullied with uniforms because they would have to buy cheaper versions and regardless, it makes bullying worse because instead of being bullied based on clothing. Now it's on weight, hair, race, religion etc. Uniforms may stop bullying on clothes, but the social-economic divide is still there, just not as noticeable.