It shouldn't. In the performance, both men and women should wear appropriate clothes, men should wear formal clothes, and cardigan vests are not suitable. A vest is a collarless and sleeveless short coat. 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 various styles of suit vests, cotton vests, down vests and wool vests.