Did some more research and I'm close to finished with the BBNylon2.

I found this micrograph of how nylon is woven in things like stockings.

Looking at this, I estimate the linear density of the fibers when viewed flat appears to be around .17 - there are lots of openings where we can see through between the fibers.

Looking at the geometry, we can see this is much more complicated than a simple weave. When this rotates, it doesn't do what a flat sheet of nylon would do. I have no hope of generating a completely accurate transmission function for this. However, I made a few assumptions and did some experimental observation (ahem) and concluded that I'm very close to done.

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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)