Trace back and front separate, adjust length to ground, then draw a line 5 to 8cm above knee line and at that level take in 2cm from center back and side seams – this makes a flattering mermaid style. Blend the line to hip level.
Flare 10 to 15cm from sides at hemline and 30 to 50cm at center back, lengthening it by 20 to 50cm to create the train.
Square down from waist dart apexes, then on back add 10 to 15cm flare to each side of the line and blend it to knee level.
Cut through waistline to separate bodice and skirt, then trace a copy of skirt pieces separate.