Most school in England require children to wear a school uniform.

The uniform

Boys
Long grey or black trousers (shorts may be worn in the Summer)
White Shirt
School tie (optional in most primary schools)
Jumper or sweater with the school logo on. The colour is the choice of the schools.
Black shoes

Girls
As above.
Girls may wear skirts
During the summer term girls often wear summr school dresses.