The complex structure of this suit aims to modify the male figure. The worse the body shape, the more obvious the modification effect.
Of course, it is the same person before and after wearing it. You can't expect a suit to turn a paunchy man into a muscular man. Thin people need the decoration of suits more.
As we all know, women with small breasts can squeeze cleavage through padded bras to achieve false breast enhancement and increase aesthetic feeling. In fact, the suit is also a fake function, and the whole upper body of a man can be beautified by it.
A good suit chest can have more than five layers, and each layer has different functions. In the most traditional British practice, the chest will leave a little more margin, and the clothes will naturally bulge to form an arc (horizontal and vertical) through the characteristics of elastic interlining, which seems to have a muscular feeling (actually it is empty inside). The term is "drum". Other suit schools may not do this. The practice of leaving no allowance horizontally is called "net". However, after a good suit is buckled, it will naturally form a vertical bulging effect, which also means some discounts. The suit on the left in the picture below is slightly exaggerated, but it shows the general effect of the chest, shoulders and waist of a high-end suit, but it is enough to highlight the chest muscles without buttons: