Trace a copy of back and full front (for the asymmetric neckline), then:

• erase all waist darts
• take in 2cm from center back at waist, 1 from back side seam at waist
• take in 1cm from front side seams at waist – blend to zero at hips and armpit
• taper skirt at knee by taking in 1,5cm from side seams and center back
• flare skirt at hemline by adding 10cm at side seams and 20cm in center back
• add extra length in center back for the train, blend to zero past side seam (see next step).

Merge back and front at bottom part of side seam in a temporary way and draw the train/hemline starting with a right angle in center back.

Draw the new neckline:

• in center back, start at waist and end on side seam 3 to 5cm below armpit
• on front, start from a matching point on right side seam and end at high shoulder point of left side (make sure you give enough coverage – minimum 10cm above right bust point)
• still on front, start approx from middle point of left shoulder line and end on left side seam – at a point matching to back. Try to be close to natural armhole.