Choose a pair of jeans that fit well at the waist and hips
Try on the jeans and mark the desired skirt length
Cut the legs off a few inches below the crotch
Open the inner leg seams from the hem up to the crotch
Open the front and back center seams as needed to create flat panels
Trim excess fabric to shape the skirt evenly
Pin the opened seams together to form the skirt shape
Sew the front and back panels closed
Add a triangular fabric insert if extra room is needed
Finish raw edges with a zigzag stitch, serger, or hem tape
Fold and hem the bottom edge to the desired length
Press the seams and hem flat
Try on the skirt and make final adjustments