Does anyone know where to get this? It is regular elastic but has buttonholes in it at regular intervals. It is so nice to put in waistbands and then leave the waistband casing open an inch or so on the inside. You can take in or let out the waist by adjusting the elastic to a new buttonhole. I’ve used it for maternity skirts and things and it’s nice for pants for growing babies and toddlers. But I can’t find it anymore.