1. Turn skirt inside out and measure out where at the waist it fits you well. Push pin it to mark the spot 2. Sew along the push pin (vertically). Then, cut excess material you will not be using. (With the skirt still inside out...) 3. Cut the bottom of the skirt to the desired length adding an inch of allowance for the hem. 4. Fold hem inward and sew down.