When I wore these capris to the flower shop the waist became looser and looser. The old elastic needed to be replaced. Removing the old elastic required opening the waist band. I added a soft knit piece from the trim stash to extend the turn-down in and make a paper-bag waist-band.
After the school-year spent at an office desk, old khaki shorts were tight in the waist. I removed the waist-band, let out the darts, and added six inches from the bottom of an old t-shirt. The t-fabric was folded over and elastic run through. Nothing fancy, but they were great for cleaning the carport this morning.