Step 1
Trace a copy of your bodice, then extend it 6 to 9cm below waistline in center front, blending to waist point on side.
Draw the plunging neckline in center front 2 or 3cm below bust line, then measure up 7 to 9cm along dart legs for enough coverage (adjust the measurement according to your breasts size).
Drop 2 to 3cm on side seam on both front and back, then draw the new nwckline.