Don't know how to do the first, but as for the second problem, set the transparency to whole body parts and clothing to about 50%. Here's a sample pic with every bodypart transparency set at 55%. You probably would like to mess with ambient settings and all that P5/P6 nodes, but bassicaly it's all about transparency.
Outdated gallery over at DeviantArt
Fics at FanFiction.net and Archive of Our Own (AO3)