Step 1
Reshape the center back moving 1-1,5cm inwards at the waist, blending at the upper back.
On both front and back draw the panels and the square cut: measure 2-3cm on the shoulder line from the high point shoulder, draw a slanted L that end in the side seam 5-7cm below the armpit.
On front, draw the button stand, the slash line for manipulating the bust dart and the new neckline.