Before attaching a pocket, iron small squares of fusible mending tape or interfacing to the wrong side of the garment. To secure the pocket, stitch a small triangle at the top of each pocket corner. Reinforce knee areas before stitching the leg seams. Cut two large, rectangular patches about 8 inches long and wide enough to extend into the leg seams. Center the patch over the wrong side of the knee area.
Machine stitch the patch in place.
Sew the leg seams. Seats, elbows and knees get the most strain. Decorative appliques or iron-on patches can be added for strength. Mend tears with machine zigzag stitching, iron-on mending tape or a fabric patch on the inside of the garment. On the right side, cover the patch with a decorative applique.