costume school uniform

Costume school uniform is an outfit—a set of standardized clothes—worn primarily for an educational institution. They are common in primary and secondary schools in many nations. When used, they form the basis of a school's dress code.
Traditionally, school uniforms have tended to be subdued and professional. Boys' uniforms often consist of dark short or long trousers and light-colored shirt, often with a tie. Girls' uniforms vary greatly between countries and schooling systems, but typically consist of a dress or a blouse worn either with a skirt or culottes or under a pinafore.