I agree with s2021. A uniform is sort of a cop out in terms of really teaching tznius.
Also, you would have less girls who wore a uniform in school and then inappropriate clothing outside of school because they aren’t going to buy a double wardrobe.
And to whoever said there is individuality in shoes and hairstyles…um, my elementary school implemented rules against “stylish” haircuts. The more right wing schools limited hair length and style to a few very specific ones). Lets be real, uniforms and school rules are to supress individuality.
(From someone who didn’t mind her uniform)