According to historical records, military caps have appeared on the heads of soldiers on the battlefield since the beginning of the war. In ancient China, the military cap was also called "Zhou" or "helmet", and its main function was to protect soldiers' heads during civil strife. According to the different materials, military caps are mainly divided into three types: copper, iron and leather. Bronze helmets mainly appeared in the Spring and Autumn Period and the Warring States Period. Later, due to the growing scale of the war, more and more people participated in the war, and leather helmets appeared, and rattan helmets also appeared in the south. The origin of modern military hats Modern military hats have appeared in various countries, and big-brimmed hats are popular. The source of the big hat is a kind of hat worn by European cavalry, but it was still a very high hat at that time. According to the rank, feathers or ponytails were inserted into the hat as decoration. Later, because food and grass were always needed in the war, soldiers who harvested and transported food and grass wore high hats, so they issued new military hats, which are now well known as big hats, but at that time, only soldiers responsible for purchasing could wear them.

With the change of the world situation, the characteristics of the big-brimmed hat have gradually changed, but the big-brimmed hat has become a popular hat style in various countries. Mainly, the big hat is solemn and dignified, and secondly, the big hat has good sun protection effect, which can protect soldiers' eyes. Finally, no matter who wears it, it looks handsome. Therefore, the big hat is deeply loved by all countries, and there is another kind of military hat, the flat-topped hat in France.

The origin of the flat-topped military cap is also called Pique in France. The origin of flat-topped military caps began with the French army. Due to operational needs, the French army replaced the original high-top hat with a short and similar flat-top hat, and the original flat-top hat was downgraded to a decorative military hat for military parade. Later, this practice was recognized by the air force and navy, and the decoration was changed one after another. Even the golden cicada thought that the hat was too high to sit in the police car, so she changed it into a flat-topped hat, so the French army changed it into a flat-topped hat for practical convenience.