I have used the back pocket to cover these and my sons and then grandsons have accepted this as an OK method!! Another way is, if you have some spare denim from an old pair, undo the non top-stitched seam and sew a wide strip across the whole front of the leg, turning under 1/4" on the raw edges. Do both legs even if only one needs it, to make them look uniform. Then stitch up the opened seam.
Nancy, February 2011