Generally speaking, in the coldest winter, Koreans wear thick clothes, only a pair of outer pants, and don't wear wool pants and cotton pants, because there is heating everywhere, which is very hot. Therefore, you absolutely don't need to bring wool pants and cotton pants. If you are afraid of the cold, you can bring long pants. Korean college students prefer jeans, so it's good to bring more jeans. Jeans sold in Korea are much more expensive than those in China, so it's better to bring a few pairs in China. If you can, you can also bring a suit (suit). There are many occasions to wear suits in Korea, and it is very expensive to buy them in Korea.