When underwear first appeared, it looked a bit like a Chinese bra. There is no cover at the back, only a cover on the chest, like the current men's vest, but the back is tied with two ropes.
Then underwear slowly developed. In the Tang dynasty, because of the special opening of folk customs and the special prosperity of culture, underwear began to develop first in the court of the Tang dynasty, and the aesthetics of underwear became avant-garde. Didn't all the Tang Dynasty have chest-length skirts, so half of them were exposed outside, and then there was an inverted triangle skirt inside, which was a bit like the clothes wrapped around the chest now.
Then there was the reform in the Song Dynasty. Because the social bondage to women became serious, the thought became traditional, and then it became more serious. As can be seen in many TV dramas, women's clothes are wrapped in thick Chinese corsets in addition to the inner three layers.
However, most of our underwear now draws lessons from western designs. Traditional costumes like those in ancient China have probably been abandoned.
First, because it is inconvenient to wear, but because the mind is not as conservative as before, there is no need to wear it, so it is very self-restrained. However, judging from the history of underwear development, clothing has a great relationship with the folk customs and social openness at that time. .