Why does the jeans break always in the same manner, first the vertical fibers, then the horizontal?

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Why does the jeans break always in the same manner, first the vertical fibers, then the horizontal?

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The vertical fibres are under more stress more often (eg – especially at the front bend of the knee)

After the first vertical fibres fray and break, this adds more load onto the other ones, so they break more easily.

And this finally exposes the horizontal threads. So they’ll start breaking too, eventually.

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Wasn’t this question part of the opening narration of “The Outer Limits”?