Decide how long you want your skirt, and cut.
Put on your 'skirt' inside out and take in some darts at the side seams to fit.
I used a jersey offcut to make an elastic casing. Thats the skirt done.
Now for leggings, I lay an existing pair of leggings on the jumper sleeves, lining up the crotch with the underarm. Then I just cut around, sew the centre front and centre back seams, and pop some elastic around the top!
(The shoulder seam does create an odd pattern when you use a striped jumper.)
Next step, put on wonderful new outfits and look fabulous!