Vest is also called iron coat or vest. It is a kind of clothes used to protect the trunk or keep warm. It originated in China and was introduced to Europe and America.

Second, the source

Yue's "Tea Room Three Stories Gaijia": "Bangchao? Wang Yingkui? " Liu Nan continued:' Today's people are called armor.' ..... According to reports, Wuzhong still calls it vest today, and immediately got it from A. "? Zhang Tianyi's A Summer Night's Dream: "That tightly buttoned vest-makes her look thinner."