Grady Pruitt writes:
A few weeks ago, I shared a tutorial on how to create a procedural stripe pattern in Blender Cycles. In a new tutorial, I show how to take one of the stripe patterns that I showed in the first tutorial and modify it so that you can get a ripple, or zig zag, pattern like you commonly see in afghans, shirts, and curtains.
(Audio is much more even on this one compared to the last one I did!)