In my old school the uniform was:
-Bottle green blazer
-House tie (winter uniform)
-White button up shirt (winter uniform)
-House polo shirt (summer uniform)
-Girls grey skirt (not pleated,resting on the knee, any shorter/not grey/pleated you get a warning)
-Grey trousers, different cut for boys and girls.
-Black shoes, any style (no boots or heels)
Anything not on this list or in the wrong style and you get a warning, so no hoodies, trainers, jumpers, etc.
In my college it is more relaxed, sort of...
Boys can wear anything as long as it is not revealing, so they have to wear a top and their underwear cannot be showing.
Girls can wear anything as long as it is not revealing, so any top can be worn as long as it doesn't show too much cleavage and any trousers can be worn as long as they are modest.
Boys tend to be called out most for their clothing due to saggy trousers or, during the summer mainly, not wearing a top. (Seriously their chests aren't that impressive anyway, unless you are into flab.) Girls tend not to be called out on since we are trusted with what we wear and the college doesn't partake in victim blaming, so guys oggling girls are punished instead of the girl being punished. (Misogyny is also not tolerated, I really love my college)