In 1 192 1 year, CPSU came to China to guide the work on behalf of Qiuerku Paderewski. Along the way, he found that China people were too poor to buy trousers to keep out the cold in autumn and winter, so he guided everyone to use pure cotton according to the experience of the Soviet Union? It is very popular to make close-fitting pants to keep warm now. After that, many people called this kind of trousers "Qiuerku Paderewski", which was later abbreviated as "Ciurufu", and later, when it was pronounced quickly, it became "Chuku". So "autumn pants" got it.