Quote - however... they're not appearing on the figure.  does anybody remember how this trick was done, back in the day?  and/or why it isn't working in PP12?  and, most importantly, how to get it TO work?  :/

I don't know how it was done in M3, but these days a "second skin" usually uses a mask and a blender node to overlay the normal skin map with a map for the clothing. With this system the second skin won't show until rendered (perhaps it will in P9). Another way is just to paint the clothing over the skin texture. A spandex morph or displacement map can add to the realism.