The vest line indicates low body fat, indicating that girls' legs are not very fleshy and their faces are not very fat. Maintaining the vest line for a long time requires persistent training, which shows that the girl is really persistent and has exercise habits. The maintenance of vest line also needs diet control. In addition to training, the vest line just can't show off eating and drinking in the circle of friends like other girls, saying that losing weight and fat every day shows that this girl is very self-disciplined.