American high school graduates can wear bachelor's uniforms and hats, because they can wear them every time they complete a stage of study in the United States, and they can wear them after graduating from kindergarten, but the styles are different.

In the United States, Harvard University took the lead in putting on the bachelor's uniform, and then universities used it one after another, but the style was different from that still used in Europe, and there were differences among schools. 1895, representatives of all schools met and established a unified clothing style. 1903 produced the uniform standard system of American undergraduate uniforms, and revised it twice in 1936 and 1960. Therefore, the specifications of undergraduate uniforms popular in American universities today are the same, but they are slightly different in some details such as colors.