Take your guys old dress shirt - he won't miss it!
Lay your dress shirt out flat and cut across the chest, just under the arms. Remove the collar, cutting at the seam. Once removed, cut the collar in two equal parts for each side of the waste.
Sew four pleats into the shirt; two in the front and two in the back. Use a ruler to make sure you are placing them evenly. I used a mannequin and pinned the pleats where I needed them. Once ou have the pleats pinned, press with an iron, and then use a sewing machine to sew all four in place.
Use a ruler to determine the right place for the two half collar pieces - place them wherever you want but make sure they are evenly spaced from the middle button. Pin in the right place and sew with a sewing machine. Cut the excess off from the back when done.
Take a piece of fabric from the unused sleeve to make a belt loop. Use a ruler to make sure you place it in the middle and sew by hand; add a button. If needed, add a button to the fron to secure the top of the skirt.
Do a final ironing, throw on a belt, and you're ready to go!