This refers to the uniform style of students' clothing stipulated by the school, which is widely worn in primary and secondary schools. Is the most familiar uniform. School uniforms originated in Europe. At that time, due to the war, some families had a hard life. In order to prevent students from such families from feeling inferior because of family difficulties, and to prevent those students with good living conditions from showing off at school, the school stipulates that every student must wear the same clothes when going to school. Later, this concept was accepted by most schools, requiring students to wear the same clothes to school. As far as most countries in the world are concerned, men's uniforms are generally suits, shirts and trousers, while women's uniforms have changed greatly except in different countries and schools. Some public elementary schools, junior high schools and senior high schools in People's Republic of China (PRC) stipulate that students must wear school uniforms every day. Non-coastal areas are mainly sportswear, and some coastal cities will issue uniforms.