It is not hard to replace jeans buttons when you know how to do it. These links will show how to replace a button on a pair of jeans.
How to Replace the Button on a Pair of Jeans (with a New or Used
The Best Mens Jeans on Sale: 19 True-Blue Denim Deals
How To Replace A Jean Button [easy Tip] Jeans Button Fix
Replacing a Jeans Button - iFixit Repair Guide
Nippies Adjust-a-Button for Jeans - Pack of 2
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How to Replace a Button on a Pair of Jeans - The Links Site
Replacing a Jeans Button - iFixit Repair Guide
Do Well Recycle
Jeans Fit Guide - Identifying Fit Issues - Melly Sews
28 Best Jeans for Women (at Every Price) to Shop This Fall/Winter
How to Replace a Jean Button: 9 Steps (with Pictures) - wikiHow