Take the back piece of your pencil skirt. I drew a straight line where I wanted the flare to be. I didn’t cut it because I wanted to keep the original pattern, but I folded it.
I measured the triangle I took out and made a separate triangular pattern piece. You can make one obtuse triangle for lots of flare, or two acute triangles for lots of flare and a seam in the middle. I went with two triangles, so I cut two of these. The key to making the flare, is to cut the triangle on the bias. This gives the flare and drape the kick-back needs.
Cut out the back as usual and your kick-back piece(s). Sew in the kick-back before sewing the center back seam. When you get to the hem, make sue you measure the hem while you’re wearing it so the hem is all the same length.