Here are three tutorials that offer tips and tricks to help you successfully sew elastic waistbands.
Sew Tessuti Blog - Sewing Tips & Tutorials - New Fabrics, Pattern Reviews: Tutorial/Video: Sewing elastic into waist tunnel casing in ONE step!
adding an adjustable elastic waist to pants/skirts
Elastic Waistband Finishes
Sewing Glossary: Three Ways To Sew Elastic Waistband Tutorial – the thread
FIT YOUR BASIC PANT PATTERN ONCE. USE IT FOR EASY DESIGN MODIFICATIONS. – Palmer Pletsch Sewing Blog
Elastic Waistband Finishes
Sewing Techniques: Applied Elastic Waistband – sewcolormusing
Tribal Print Cashmere Feel Unisex Scarf With Fringe –
How to insert Elastic into Jeans Waistband — Sum of their Stories Craft Blog
Types of Waistbands
Three Tips for Elastic Waistbands, Blog
The Details: How I sew elastic waistbands - KT's Slow Closet