There's nothing individualistic about what adolescents wear.
Disagree. But even if we accept your premise, at least they're choosing to wear the same stuff as everyone else, rather than having the school force it upon them.
I'd make the argument that uniforms place less burden on the poor. Eliminates designer labels, allows for Two or three school uniforms to be used by a student, and often times they are cheaper and have assistance programs
But unless they wear the uniforms as normal clothes outside of school, or get them completely for free, then they're still spending more on clothes than they otherwise would have.
Not really, quite a few families make a major expense of buying nicer school clothes for their children, this includes all levels of income. Being able to buy a couple uniforms for school would be cheaper than buying several school outfits. Something parents sacrifice to do all the time.