What ancient poem does Little Man's Waist come from?

From Bai Meng's Poems and Feelings of Things in the Tang Dynasty.

Small waist: It originally refers to Bai Juyi's small waist as slender as willow, and later refers to a very thin waist.

Tang Mengbang's Poem on the Feeling of Technology and Things: Bai Shangshu (Juyi) Su Fanren is good at singing and prostitutes are good at dancing. It tastes like a poem: cherry Su Fan mouth, willow waist.

Small waists have been the curvy beauty pursued by women since ancient times, not unprofitable slim waists. The aesthetic of small waists is caused by men, and a slim and lively girth woman is almost every man's ideal lover image. Many women pursue this aesthetic regardless of the consequences. Nowadays, in order to pursue curvaceous beauty, women only eat a little poor food every day, which affects their health and makes them breathless when they walk. However, it is not as serious as in ancient times. In ancient times, there was a saying that "the king of Chu had a thin waist and starved people in his palace", which starved people to death. It can be seen that the temptation of thin waist is too great.