JK is a uniform for Japanese high school students. JK uniforms come from sailor suits, which come from Europe. This is a military uniform. /kloc-was introduced to Japan in the 0/9th century and began to be used as a navy uniform. In 1960s, it was influenced by Qiang Bing, a rich country in Meiji Restoration, and flowed into schools and young people. There are many kinds of JK uniforms, if subdivided, including intermediate clothes, vests, winter clothes, cardigans, suits, vest skirt, summer clothes, coats, sweaters, shirts and so on. Probably according to the different forms, it can be divided into sailor suit and suit style.

Although the layout of JK uniforms is daily and there are many collocations, there are some basic standards, such as crisp fabrics and sharp skirts, which is also an important quality standard, so there are many unorthodox JK uniforms with unqualified quality in the market.

Regarding lapels, orthodox JK uniforms say that lapels are not reflective, in fact, because of the material problem of lapels, and the vertical texture is generally orthodox JK uniforms. Whether it reflects light under the naked eye effect depends on the material.

Lapel styles can be roughly divided into three types: viper thread, mountain thread and woven lapel thread. A few lapels are just a few books, such as no books, one, two, three books, one thick and one thin is the parent-child line. There are many kinds of bow ties in JK uniforms. Besides the most basic straight bow ties, the common ones are feather roots, rabbit ears and long handles.