San Francisco sewing expert Sandra Betzina, uses Ban-Rol stretch elastic almost exclusively in her elastic waistbands. She cuts the elastic based on
Wholesale Staple Ban-Rol Waistband Interfacing - Sew-in
Ready Made Waistband w/Banroll Reinforced - Black or White - B
51mm (2) Ban-Rol Super-Stretch Waistband Elastic – Riverside Fabrics
Waistband 2in Ban Rol White 25
Sewing an Elastic Waistband - Threads
BanRol Stretch - Waistband Elastic - The Sewing Place
Sears Roebuck Vintage Flexslax Blue Tone Pants Polyester Mens 36 x
Magnetic Thread Lubricator Sewing machine thread, Sewing
Fuse & Stretch — QST - QUALITY FROM THE INSIDE OUT
Top Down Center Out with the Eve Trousers – The Crooked Hem
Stretch Sateen Twill - 60 - The Sewing Place
Ban-Rol Original Waistband 1.5in wide
Dritz Heavy Strtch Waistband 1.5x1.25yd White 9319W - 123Stitch