Pauline, I believe that Sandra Betzina has an elastic waistband technique that gives the results you're looking for in one of her books. At the moment, I can't remember if it's in No Time to Sew (which also comes with patterns) or in Power Sewing, Step by Step. I'm inclined to think it's the latter, though. I can't get to my books right now, or I would check. All of her products can be purchased on her website, but that part of the site is down until the end of October.

However, you might also find these books on Amazon.
