What's the purpose of the tiny pocket that comes on the denim

Interesting Facts That Will Blow Away Your Mind - Corporate Review

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Deep in the right pocket of my dress pants is a small built in pocket, what is it for and does it have a name? - Quora

Why do our jeans have a tiny pocket just above the front pocket? Was it something useful that was added or is it just a fashion thing? - Quora

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What is the reason some designers include a 'striped' finish on the top front section of jeans (ending a bit below the pockets)? - Quora

What's the purpose of the tiny pocket that comes on the denim jeans? - Quora

What designer jeans have a line with a v on the back pockets? - Quora