The elastic waistband is too big. No need to cut it. Just make it smaller like this. Full Video
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ズボンのウエストバンドにゴムを縫い込む正しい縫い方のヒント!
How to take in elastic or replace elastic on waist pants by hand
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パンツのウエストを簡単に小さくする方法!
#shorts How To Tight A Loose Pant (Lower) Elastic Waist
TAKING IN YOUR PANTS | DIY tutorial of how to replace the elastic in a waistband | Quick Sewing Fix