What are you focusing on about the uniforms? That might help come up with an opening.
Or try something like..
In a nation so focused on being different, we sure are stuck in such uniformity!
Or..
They say to "Be Yourself", but how can you do that when you look like everyone else?
Or
Clones! Schools out to get us to all look exactly the same!!
I don't know where you are trying to go with it.. but Hope that helps.