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
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How to Sew and Topstitch an Elastic Waistband » Helen's Closet
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uhlsport Tights Men's Pants, Very light, tight-fitted, Elastic
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Flat Elastic Waistband Material