I have 4 granddaughters from 1 1/2 yrs old to 12. I can’t sew anymore for the 12 yr old because she is too picky. The two 4 yr olds and the 1 1/2 yr old are still fun to sew for. I read recently about using buttonhole elastic for waist on their pants and shorts. Has anyone done this? How do you install? I cannot find the elastic locally and would have to order over internet. Not sure whether to try or not.