First, draw the new neckline on both front and back. Front neckline is lower then bust level, back is quite open. We suggest to keep the shoulder 3-5cm wide.
Shape center back both at waist and knee by 1,5-2cm inward.
Shape the skirt by tapering 2-3cm at knee from side seams and flaring 10-15cm at hem. Draw the back train by flaring center back by 15-20cm and extending it by 20-25cm.