The cloth behind the Japanese military hat is called "military hat hanging cloth", or "hat hanging" for short. It is a standard appliance distributed by the Japanese army. China people call it "fart curtain". Since heian period, Japanese military uniform armor has generally adopted sunshade curtains, cloth curtains for light marines and helmets for senior warriors. After the Meiji Restoration, Japan began to combine traditional culture with western civilization and advocate Bushido, so this kind of military hat fell off.

In fact, since the Meiji Restoration, Japanese military uniforms have changed their designs every year and every four years. In terms of design elements, they copied elements from many countries, including China, so sometimes they feel different when they see Japanese soldiers dressed up. In addition, Japanese military uniforms also consider rank factors, and there are differences in clothing design from colonel to captain.

Tradition: This can be traced back to ancient Japan, when infantry was called "going into battle lightly". Soldiers who go into battle lightly still wear a hat when they fight: an array hat. At that time, there was a curtain in the design of the array hat to block the sun, and later a neck curtain was added to block the neck.

Although Japan in the shogunate era used French military uniforms, the array hats were not abandoned. After the Meiji Restoration, Japan did not give up its own culture while learning European culture, and the array elements were preserved, so there was the "pig ear" design during World War II.

It was not until 1899, when Japan ruled Taiwan Province Province, that the Japanese army in Taiwan Province Province began to distribute hat pendants, which later became "curtains". Because of the cool weather, the hat pendant can not only protect the sun and prevent heatstroke, but also prevent mosquito bites. They are only used in summer, which is one of the functions of hanging curtains. Since then, it has been promoted in the Japanese army.