Elastic waistbands in the apparel industry use knitted or woven flat elastic. See a variety of elastic waistband solutions, including GW50 and GW61 options.
NWT Just Friends Girl's Navy Blue Knit Stretch Pants, 3T
Twill Elastic Band Double Side 2 Flat 4 Yard 1 Roll Flat Elastic
Drawcord Elastic Waistband - Drawstring Elastic - The Sewing Place
Flat Elastic Waistband Material
Rainbow coquette scene queen lace layered bloomer / - Depop
Waistband Elastic - Various Widths – EWE fine fiber goods
Formal Stretchable Pant with Expandable Waist for Men. Regular Fit
The Cute Elastic Waist Pants You Need To Embrace (And No, They're
NWT Just Friends Girl's Navy Blue Knit Stretch Pants, 3T
How to Sew Flat, Flattering Elastic Waistbands - Threads
How to Sew Elastic (with Pictures) - wikiHow