Skip the casing and sew on wide elastic for an exposed elastic waistband. This technique will come in handy for sewing boxers and skirts.
Elastic Waistband - Professor Pincushion
How to Sew an Exposed Elastic Waistband
How To Sew In An Elastic Waistband
How to Make an Exposed Elastic Waistband - Simple Simon and Company
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How to Make an Exposed Elastic Waistband - Simple Simon and Company
How to Sew an Exposed Elastic Waistband in 5 steps - Cucicucicoo
pleated Minerva
elastic Archives - Professor Pincushion
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Elastic Waist Tank Dress Tutorial - the thinking closet
2020 Upcycled Umbrella - ntno