Step 1
Mirror the front for the asymmetrical style.
Draw the neckline and widen the shoulder dart by 1 cm at it, then draw the bust and waist cuts as you see in the photo.
On the front skirt, reduce at the hem a couple of cm from each side, draw the flounce and the slit line.
On the back, draw the neckline, discard the waist dart half from the center and half from the side seam, draw the skirt line and the back part of the flounce.