Step 1
On front full copy, adjust length first.
Then reduce 2cm from each side at hemline, blending to zero at hipline.
Shorten left shoulder line to 5 or 6cm, then drop left armpit point by 1,5 or 2cm and redraw left armhole.
Create a 3 or 4cm wide shoulder strap for right side, ending in a V neckline.