In addition to the toecap geometry moving in strange ways when posed, the UV map ended up with unmatched V values where the edges meet. I had hoped that the V coordinate would correspond exactly with height above ground. In that case, it would be totally simple to create socks or stockings of any length using a simple node comparison to the V coordinate. Using a couple numerical values, I had planned to adjust the stocking height, and the width of the welt. I had also expected the heel to UV map to roughly a square region, etc.

Since that isn't the case, a mask texture is required to control the 2nd skin. I don't do drawing of any kind, so I gave up.

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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)