On back, erase the dart from the waist upward and discard its volume from center back. Draw the back neckline straight from the armpit and another line 6-8cm below it.
Keep the dart on the skirt piece and square down from dart apex to create a slash line.
On front, draw the neckline from right side seam to left shoulder and the front cutout in center. Draw also the side cutout with a matching measurement to the back.
On skirt, mark as a slash line the center front and a line starting from dart apex and perpendicular to the hem.
On both front and back skirts, flare 4-8cm from side seam.