2. Distinguish between front and back.

3. Used for heat dissipation and air exchange.

In the south of Huaihe River, it is called cotton trousers, and in some places it is also called underpants and thread trousers. Autumn trousers belong to underwear and can't be worn outside. Moreover, the degree of warmth is second only to that of warm pants, which can effectively prevent cold. Qiuku is a northern word.

According to English etymologists, the name autumn trousers comes from American heavyweight boxing champion john sullivan, because he likes to fight in the boxing ring in autumn trousers?

Extended data

The origin of autumn trousers is the North American continent. It is said that the first patent of autumn trousers design was obtained by Canadian Frank stanfield. He and his brother started with cotton underwear which is known as "non-shrinking", and formally applied for the patent of autumn trousers on 19 15 12.7, becoming the father of modern commercial autumn trousers.

In the year of1914-1918, one of the main underwear purchased by various armies was a kind of thing called "combined clothing"-this kind of clothing that completely covers the upper and lower parts and tightly closes the hands, feet and wrists, which is actually equivalent to the combination of autumn clothes and long pants.

Baidu encyclopedia-autumn pants