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.

Cut through all lines.

You will get:

• back bodice
• back skirt, with darts and slash line from it
• front bodice, with darts
• front skirt, with darts and slash lines.

Take the skirt pieces. Cut through the slash lines, close the darts and open their volume into those cuts.

Space the front pieces in the center.

Make a copy of both pieces with the new volume.