I usually use iron on denim on the inside and then just zig zag or mend stitch the H E dbl L out of them..use matching thread and they don't look too terrible....Sons and now their sons are always bring me the most torn things they can find....unfortunatley they all beleive Mom (Grandma) can fix anything. Seams are terrible but if you use a large enough piece of iron on you can sew each side of seam and only catch the thick part occasionally. good luck