This is caused by the excessive angle of the rear sleeve center line and the insufficient angle of the front sleeve center line.

In the round sleeves, the bottom sleeve of the front sleeve is not fully excavated, and the shape is not consistent.

It is very important to finish the sleeves' structural drawings and cut them down and put them on the sleeves.

Generally, the front sleeve bottom splicing point is lower than the front armhole bottom arc 0.5 ~ 0.7 centimeters as well.