If you intend to use mat zone "Stockings" for all the lower leg materials, you should now Invert your selection of polygons. The lower polygons should be highlighted. Assign them to material Stockings.

Repeat the above for your other thigh.

Then go through the rest of the lower leg zones and re-assign them to Stockings.

The divisions should look like this. Notice how the boundary is higher.

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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)