Oh boy,

I did take a long look at your last render, and at the material setup.

The last render.

1. In the GC DISABLED (left)  you see on the light meter that you have too much light.
   Reduce light till the light meter says it is OK.
   Render.
   What will you see?
   Yes, a very - very DARK suit.
   With that light setting, the right one will become even darker.

First step; adapt the material settings to get what you want NON GC.

2. The material setup.
   This is a material build for multiple lights, or in a period before IDL and or GC came to Poser. (one of the 2).

Result; the material only looks good when light is shining directly ON it.
It is a disaster for ambient light.

The fall off from light purple to dark purple is overdone.

In most of my tests I get edge purple that is darker then black. :-) :-) :-)
In the armpit, in shadows, the purple color fading from front to side goes too fast. 
And as bantha said, it could use some specular.
The edge blend steering over the Color ramp nodes is too agressive, darkening too fast and too harsh.

02:30 AM here, the rest is for tomorrow..
Happy experimenting, and happy Posering.

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"!