This is adding a second skin, and using the nodes in the advanced material room to create the Blender mask internally.
The color of the clothing can also be adapted by changing the Input_2 color in the Blender node.

Also see how I build the bump/displacement from the cloting diffuse texture. to get thickness in the clothing.
Right click should get the screengrabs in full size on your HD.
Well, it did in the past but with the current forum degradations, one never knows any more.
Best regards, Tony
 

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!