In Poser 5 I'd use a displacement map. Now, here's a thought. Instead of a mesh pattern as a transmap, use it to control the model surface and forget about the catsuit object. That is, feed it into the displacement map input to get the physical thickness, and also use it to control a blender node, which combines the body texture with the material for the mesh suit. You could do the body texturemap as a pre-built texture, using layers in the paint program, but you'd still need the distinct displacementmap texture.