People who often watch Japanese dramas know that female students in Japanese schools wear short skirts, even in winter. Even sportswear is the same. Everyone wears shorts similar to swimming trunks to go to physical education class, which makes people wonder whether it will be cold. In fact, the official name of this kind of sweatpants is "blomer", but now Japanese students have never worn it or even heard of it. What is the reason?

Japanese blue shorts originated in the Showa era, and people think that they were invented by American Elizabeth Smith Miller. At first, American men didn't like the design of shorts, but with the improvement of women's status, these shorts have become students' sportswear, which means that women can participate in sports events and exercise. Then it also means that women are no longer bound by the concept of corset and are moving towards the concept of gender equality.

Until the 1950s, the Japanese government improved foreign clothes, such as sailor suits and blue shorts, to introduce western ideas. This design has been used by the Japanese government for many years. However, in recent years, it has become less and less common on campus. The reason is that there are many pornographic places or audio-visual works in Japan, which are marked by close-fitting shorts, which makes the public have a very bad impression of this kind of sweatpants and think it is obscene, indecent and harmful. So many schools are cancelled now, and girls are changing their sweatpants.

In order to introduce western ideas, Japan imitated foreign clothes and improved them.

The disappearance of "blue shorts" in modern times is mainly due to the change of physical education class's content.