Trace back and front and lengthen them to ground. Then:
- draw a line 10 to 15cm above knee line, then taper by 2 to 3cm on side seams and center back, blend to zero at hip
- flare hemline by 10 to 16cm on sides and center back and redraw side seam meeting previous line
- mirror front to have it full, then square down from left waist dart to hemline
- cut through waistline to separate bodices and skirts.