
Step 1
Lengthen the dress to ground, then flare 3 to 5cm from sides.
Draw also the new neckline on both back and front.
Then trace a copy of back and front mirrored, then on front draw the slash line from left side 10 to 12cm below waistline to right side seam at hipline. Lengthen front waist darts to hit the slash line.