Choose a pair of jeans that fits your waist and hips well
Decide the skirt length and mark it with chalk or fabric marker
Cut the legs off at the marked length
Open the inner leg seams from the crotch down to the cut edge
Remove the front and back center seams if needed for a flatter shape
Overlap the opened front panel edges to form a skirt front
Overlap the opened back panel edges to form a skirt back
Pin the fabric in place
Sew the front and back panels together
Add a triangular denim insert if extra room is needed
Trim excess fabric
Finish raw edges with a zigzag stitch, serger, or hem tape
Fold and hem the bottom edge
Press the seams and hem flat