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you need:
jeans
narrow cutting board or cardboard piece
knife
vacuum cleaner

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Slide the cutting board into the leg – this is to avoid the back side being slashed.

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It’s best if you wore the jeans to see where to start slashing. I started just above the knee.
Start slashing the jeans horizontally – Do them in sections instead of the whole width of the jean for more destroyed effect.

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Slash first, then scrape off the denim to reveal the threads.

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Pull out the denim fluff and discard. This will cause considerate amount of dust, so have a vacuum cleaner ready.

Result:

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by park&cube