Long underwear
Autumn trousers refer to trousers worn under woolen trousers, cotton trousers or outer trousers to keep warm when the temperature is cold, usually worn when the weather turns cold in autumn.
In the south of Huaihe River, autumn trousers are called cotton-padded trousers, and in some places they are also called underpants and thread trousers. They belong to underwear and can't be worn outside. Their warmth is second only to warm pants, which can effectively prevent cold.
The origin of autumn trousers is the North American continent. It is said that the earliest patent for autumn trousers was obtained by Canadian Frank stanfield, who formally applied for the patent on 19 15 12.7 and became the father of modern commercial autumn trousers.