Why are the shoulders of the suit concave to both sides?

It has something to do with your shoulder shape, round shoulder. Also, the sleeve pocket was not handled properly when it was drawn, and the embroidery was too high. You are the kind with round shoulders, and the shoulder pads are not obvious. You should make the shoulder width smaller and make it up on the sleeve.

Oblique pleats at the front shoulder and neck (also known as splayed pleats) and the shoulder line running backwards are common problems in the shoulders of suits.

The main reason for this phenomenon is that the garment pieces have not been processed three-dimensionally or the processing is not in place. There are only two pieces of clothing shoulders, but the curved surface of human shoulders (above the bust) is complex. If these two pieces of clothing (plane) conform to the shoulder shape (curved surface), it is necessary to carry out three-dimensional plastic treatment on the clothing. Only after the garment piece is correctly shaped can the problem of oblique pleating at the neck side be completely solved.

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Viewed from the side, the sleeves should be as thin as possible to conform to the natural curvature of the arm. When the arms droop naturally, there should be no wrinkles. When the hands droop naturally, the shirt is about one centimeter short.

Too big a suit will cause: a pile of wrinkles on the elbow; The sleeves are too long to cover the shirt cuffs.

Too small suit: the arm is tight, and there is obvious pulling at the armhole, which is folded radially.