I have made several skirts from jeans (here is my post) and I have never really been happy with the inside finish. So I decided to put a little extra time into the process when sewing this one. I am very happy with the outcome. I got these Tommy Hilfiger jeans and the jeans I used for the insert for $1 each.
After taking the jeans apart and cutting the jean leg insert I pinned everything together. After sewing the outer row on the first seam (I did this by top-stitching on the right side) I turned the skirt inside out. I then trimmed the seam to about 1″ and zigzagged that edge. Next I ironed this fabric in the direction of the rows I would sew next and then finished those rows. I repeated these steps for each of the next 3 seams. I hope this isn’t to confusing. I took pictures of each step.