I have loaded the Rainbow Light Bodystockings(G8F), and while working in either Texture Shaded mode or NVIDIA iray mode, there is no poke through, but when I render the scene, I get poke-through. Of course I have adjusted the stockings, and although that does eliminate the poke-through, it also looses the fit to the legs, which looks bad. I'll also add that the leg is not bent to any extremes, and there are no exaggerated body morphs being added to the G8F figure.

(Texture Shaded View)

(NVIDIA iray View)

(Spot Iray Render View)