just to say, with stockings or tight-fitting clothes, it goes the other way, too.  stockings or other skin-level elements floating even a tiny amount is immediately identifiable and glaring, imho.  but then, i watched people praise a bodysuit and body hair transmap combo, when all i saw was a glaring CG error of hair floating over the skin like what it was: a flat hair coat.  so what i see and what everyone else sees isn't the same.  that said,  in my experience, postworking so small an precise a change can be a big PITA. and i've never seen 2nd skin stockings look bad unless they were mapped badly.