A couple of years ago, I took a pant fitting class at the Worcester Sewing and Quilting Expo. The class was taught by Peggy Sagers. I now can sew pants that fit me perfectly. If you ever have an opportunity to take her class, I highly recommend you do it!
With my custom pant pattern, I made a basic skirt sloper. I sewed a mock-up to correspond to it, complete with a zipper. It has been hanging in my sewing room since 2007. Last night, I broke it out to draft a pattern for a skirt to go with my red leather jacket. I tried on the mock-up just to make sure I was still happy with the fit.
The sloper is for a mini skirt. I want this skirt to come to just below my knees, so I added length. I converted the darts in back to princess seams. Then, I angled the seam lines and added additional style lines.
I did this for the front and the back. Next, I drafted facings for the waistline. Voila! I now have a pattern for a skirt to go with my jacket!