The function of splitting the door is to make the clothes fit tightly. Because a person's chest will form a certain inclination from the highest point to the collar point, in order to solve the problem of chest inclination and make the clothes fit next to the body after wearing, men's wear mostly adopts the method of opening the upper part of the front coat, that is, opening a certain value inward from the top of the front neckline, which is arc-shaped along the bust line or arc-shaped along the belly line. Women's wear mostly adopts the combination of saving implied by dividing doors or dividing lines. When the splitting tip falls near the bust line, it is called splitting the bust door. When the splitting tip falls near the outline of the abdomen, it is called the abdominal splitting door.
What the body looks like. Mao Dun's Color Blindness III: "He waved the five fingers of his right hand and proudly made a gesture of fishing into space.