Step 1
On back, reduce the dart by shaping the center by 1-1,5cm (taper at upper back and at hip line). Draw the princess cut ending at armhole and manipulate the dart there, then square down to the hem and flare 4-6cm on each side. Flare from center back and side seam the same amount.
On front, flare the same amount from the sides, then draw the neckline and additional piece that create the knot: see them marked in red and light blue.