Gathering with elastic. Gathering with a zigzag stitch.
Learn How To Sew An ELASTIC WAISTBAND For Shorts, Skirts & Pants
Sew Elastic - Stretch Your Options - Part 1
Top-Stitching an Elastic Waistband
Let's Add Some Clear Elastic To Our Waistband!!
How to Serge Elastic to a Waistband by Sew Sew Live
Exposed elastic waistband, similar to a retail garment, using a
Sewing an Elastic Waistband (My 2 methods)
Adding Elastic to Shorts
Serging elastic to material