Hi: Does anyone know if the elastic that is used in the waistband of readymade children's clothes (GAP) is available on the market? This elastic has small buttonholes all the way down the center of the elastic, is attached at the center back of the garment,and is pulled through a button hole in the waistband and attached to a button. The idea is to cinch in the waistband for those skinny little girls and is adjustable to fit many sizes because of the many buttonholes on it. My granddaughter is really only a size five around the waist but needs a size six for her round little tush. Slim pants don't work for her. But the superelastic helps alot. I've checked Joann's and they don't have it. Hopefully someone out there knows if it is available. Thanks.