I used to work in a school uniform shop, and it was pretty standard to get 3 dresses, 6 pairs of socks, 2 jumpers, 1 blazer, 2 winter skirts, 3 winter shirts, 6 pairs tights, 2 sports uniforms (sports socks, netball skirt, bloomers, t-shirt, track pants), 1 spray jacket, 1 hat, 1 tie, 1 school bag.

Some parents would also buy 3 or 4 undershirts.

Some obviously bought a lot more - anything up to 5 dresses, 5 jumpers, the library bag, the sports bag, etc - but the above was the standard.

These weren't schools which would let you travel to or from school in sports uniform though, so the formal uniform had to be worn every day.

HTH