Step 1: Materials
Scrap material (Double the length of the widest part of the shorts.) Or you can use lace. Girl-li-fy it as much as possible.
scissors, measuring tape, sewing machine.
Step 2: Castration
Sew the flap shut.
Cut right across the seam going from one leg to the other.
Pinch up the excess, pin, and sew. Cut off any excess material.
Step 3: Hem
Step 4: Fringe
Pin the raw edge of the fringe to the shorts' hem.
Gather the fabric as you pin so it makes a wave around the edge. Sew to the bottom edge of the shorts.
Step 5: Lather, Rinse Repeat
You can now wear your shorts - oops skirt. If you want to add more layers, repeat the process. The only difference is that you will cut the elastic waistband off, then pin the second layer under the first. Sew in place, and cut off the excess.
Step 6: Add Ons
Make the skirt any way you want. This one has a belt at the top, straight fringe, & leather ribbon over red ribbon.