Does anyone know how to rip jeans effectively, similar to the point at primary brands? Ok, I am a jean lover, especially ripped jeans, and i want...

Ok, I am a jean lover, especially ripped jeans, and i want to know, how can i rip jeans without buying them for $50 and up? I hear sharp sandpaper can do the job, as okay as scissors somehow. If anyone can give me an answer as all right as a detailed procedure, I will be soooo happy! Thanks!
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Answers:    Olfa blade or single-edge blade blade would work; put the jeans on and mark "where" next to chalk.
Be sure and put some heavy cardboard inside the leg so you do not inadvertantly cut through both layer.
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I did it back surrounded by the eighties..The height of ripped jeans couture! LOL
I would use scissors, paint the edges of the cuts beside bleach and wash next to hot water twice...Always seem to look right.