Shorten the shoulder

To shorten the shoulder, make a mark in the middle of the shoulder and the half of the armhole, the line should not make an angle by touching the armhole.

Connect these two points, then cut along the line starting with the shoulder to the armhole leaving a grip.

Report the distance to remove from the grip to the neckline. Paste the cut-out part against that mark.

Redraw the shoulder. Check whether the armhole hasn't got angle, if so redraw it.

Do the same on the front and back of the bodice.

Lengthen the shoulder

To lengthen the shoulder, make a mark in the middle of the shoulder and the half of the armhole, the line should not make an angle by touching the armhole.

Connect these two points, then cut along the line starting with the shoulder to the armhole leaving a grip. Paste a piece of paper on one side of the pattern. Report the distance to add from the cut to the armhole.

Paste a piece of paper on one side of the pattern. Report the distance to add from the cut to the armhole. Paste the cut-out part against this mark and redraw the shoulder line. Check whether the armhole hasn't got an angle, if yes redraw it.

Do the same on the front and back of the bodice.