I've found that it's best not to sew or stick along the top or bottom of the patch when attaching it to the knee of a pair of jeans. The knee needs more material to cover it when bent than it does when straight. If the patch is sewn along the sides, but free at the top and bottom, it can move when the knee moves to provide better patching. Also (or alternatively) use a longer piece of material than you think you need when patching knees, for precisely the same reason.
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