What is the back cinch? Denim FAQ answered by Denimhunters

On jeans, the back cinch is a feature used to tighten the waistband. It consists of two denim straps and a buckle, placed on the yoke of the jean.

The Denim Encyclopedia by Denimhunters listed alphabetically

Defining Features: What Helps Us Keep Our Jeans Up, by Felix Bojan Pecarski, OK Felix

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All your denim questions answered. The Denim FAQ by Denimhunters

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Buying Guides to Well-Made Menswear and Denim Encyclopedia