I attended a small girls high school, 67-74, with a very strict uniform code. Not many deviated from it - the deputy head was a tyrant!
1st and 2nd years - grey tunic, white blouse, tie,black cardigan, white socks.
Years 3, 4 , 5 - grey skirt,black cardigan or V neck jumper everything else the same.
Upper/Lower 6th - blue or pink checked gingham blouse, no tie, black cardi/ jumper - and tights were allowed!
Summer - blue and white spotted dresses with belt and full skirt, and blazer.
Hair accessories had to be navy or black. I remember once, in the first year, my mum was in hospital, and my dad couldn't manage a ponytail with my waist length hair, so I went with a mid blue elastic hairband. I was pulled out of full assembly by the headmistress, and made to stand on the stage while everyone filed out! I was so upset, my dad went up to school the next day ( the only time he ever complained about anything at school! ) and gave the headmistress a piece of his mind. She apologised.
We were told we were representing the school while in uniform, and to behave accordingly, no eating in the street etc. People did report pupils for misbehaving in those days!