Japanese traditional underwear is pocket underwear. What about China?

To tell you responsibly, China people didn't have the habit of wearing underwear in ancient times, and not everyone in Japan wore pants. Basically, Japanese people didn't wear underwear in ancient times, but only at certain people and at certain times.

Before the Opium War, underwear was one of the products sold to China by foreign countries, but people in China didn't buy it because we didn't think it was necessary to wear it. Later, because many things could not be thrown away, war was triggered.