Now remove the first (lower) line of pins, then fold the jeans outward so the original hem edge meets your second (upper) line of pins. Pin this fabric in place evenly all the way around. Make sure the seams align at the sides. Take the jeans to your sewing machine and stitch right next to the original hem. It helps to fit the tube of the jean legs over the "free arm" of your sewing machine, if you have one, so the fabric lays flat.