If your trousers and skirts don't fasten well or they are tight on the waist try the Waistband Expander.
After washing them, apply Waistband Expander on the waist and let it dry.
Estimate how much you want to widen them and the extra parts. Make sure it is tight enough in the waist.
Set include 5 colours: blue, black, grey, dark grey, beige.