Ready for stage 2. Now we consider the horizontal fibers. Well, not strictly horizontal in general, but those that are following the curve, instead of arranged by the curve.

The gaps are always the same, no matter where the curve is. The opacity is exactly what the "density" of the fibers is. If they are 30%, then 30% of view through the cloth is blocked, and 70% is open.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)