Children should not go to govern-cement schools... i mean, indoctrination low security prisons

That said, uniforms are a must in school.
If learning is the most important thing, than minimizing girls trying to get the boys to notice them in a clothing race to the bottom is very important.

This one up (down) wo-man-ship that girls do to win the sexuality race is destructive.
Uniforms eliminate this.

And for all those who are not in the fashion race usually find a known and comfortable uniform a good thing. As you said, one less choice to make each morning.