This was an overall skirt that I seldom wear.
Turn it inside out and sew close the bottom part along the red line as shown in the drawing, leaving two holes big enough for your feet to go through. Cut away the excess fabric, turn right side out.
You can also refashion your midi or maxi full skirt this way. Hope this tutorial is useful in some way, please share if you make something similar.. thank you (^_^)