Metal rivets on the corners of jeans pockets
Little copper-coloured studs sit at the corners of the pockets, doing nothing visible.
Category: Clothing
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Feature. They stop the pocket tearing off.
Tailor Jacob Davis and Levi Strauss patented the idea of riveting the points of strain on trousers, such as pocket corners, on 20 May 1873. The pocket you overfill is held on by metal rather than thread alone.
Source: US Patent 139,121: Improvement in fastening pocket-openings, US Patent Office, via Google Patents.