Let’s draft the pattern of this asymmetrical dress.
Start from a basic dress with darts and full front.
Draw the straight neckline on back and the halter one on front, extending it to create the shoulder straps.
Draw the slash lines for manipulating the darts.
Draw the front side panel on the skirt.
Cut through all the red lines.
Get the front, close the existing darts and open the new ones.
Flare the sides by 3cm and trace the panel separately.
Separate the back skirt and bodice and extend it towards the center to create a bow.