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. A vest is a kind of coat without collar and sleeves. Sleeveless jacket, also known as vest or vest, is a collarless sleeveless jacket. The main function is to keep the front chest and back chest warm and facilitate the activities of hands. You can wear it under your coat or under your underwear. The main varieties are suit vests, cotton vests, down vests and wool vests of various shapes.