I live in the UK and nearly all Primary and secondary institutions have school uniforms I know I did in my primary and secondary schools so that's ages.
4-12 and 12-16 Apparently the collages (two because I got excluded :/) I wento after that used to have a policy but it eventually became untenable mavericks have a tendency of wearing the opposite genders uniform as an act of defiance. And then the idiots were like
gonk scream gonk
Anyway yeah Uniforms in my experience are total bullshit I got bullied the ******** out of it doesn't matter what restrictions you put on dress code teenagers and children will still be dickheads.
It's been demonstrated time and time again that uniforms are ALWAYS going to be used as a scam by the school to extort money from parents. Hang on source.
http://news.bbc.co.uk/1/hi/education/6369213.stm
And yeah in my many years of experience the school uniform is just a waste of resources for hyper-authoritarian types. You shouldn't invest in control measures unless they actually have a point.
Although I will say this my secondary school uniform consisted of a Maroon sweater with the logo on it and black trousers. When I was self-harming nearly every day and I would suffer a massive haemorrhage in the middle of class bathing myself in blood, unless you actually touched me and realized I was bleeding profusely you could never see the blood stains.
If I choose to wear the same colour combination of Dark red and black for 4 years then you might have suspected something was wrong with me.