With this stick-and-fold waistband, also called waist-shaper, you kill two birds with one stone: reinforce the fabric and make a nice straight fold! The stitching and folding lines are marked with narrow slots, so you can easily make a reinforced waistband with a razor-sharp fold. Place the tape with the glue-silk on the fabric, put a thin cloth or a layer of paper on top and attach the tape with the hot iron. Let the glue harden for a while. Then you can fold and stitch the waistband. 
Dimensions: 10mm-30mm-30mm-10mm (total width 8 cm) Waistband/shoulderband 3 cm wide