Elastic-waist pants are the easiest to modify, of course, since the absolute only thing that you have to do is swap out that elastic.
How to Replace an Elastic Waistband : 6 Steps (with Pictures) - Instructables
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How to replace elastic waistband by hand/ DIY without sewing machine.
How to Replace an Elastic Waistband : 6 Steps (with Pictures) - Instructables
Need some advice on taking in an elastic waistband by hand : r/HandSew
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