Ok, go grab this from freestuff. https://www.renderosity.com/freestuff/items/74593/pd-soft-leather-poser-materials

PD always includes a preset called Invisible. Apply the invisible preset to all parts of the model. You should even be able to Pose the figure and once the figure is invisible the clothing will stay in that pose. Hope this helps.

Hi @SpookieLilOne, thanks so much for the reply. Does that just make a material transparent? I need everything behind the figure to be knocked out as well. For example, in the hair above, the back of the hair is obscured by the figure, so I need that knocked out. I would simply remove backfacing polys but that will remove some of the polys I do need, for example in a high-low skirt. I hope I'm making sense.

There is an easier way, I think. Go to the Hierarchy Editor window and select the actor to be made invisible. Click on the eye to hide the actor or character. Presto! It's invisible. But in the case of the hair, you may have to unhide the hair by clicking on the eye by the hair. Just a thought.

Here it is, rendered.

Thank you so much, but that's still not what I need. I'm familiar with basics like hiding nodes and transparent materials.

You see how the back spaghetti straps show up? The ones that would be on the back of the body? I need those to be hidden/transparent as if the body were there. Same goes the back of the hair (inside of the skullcap. 

Basically I need to be able to render 2D Vicky naked and then lay 2D rendered hair/clothes on her for a project.

I'm thinking that there may be something that can be done in a render pass?? I don't know...

Also...another thing I already tried is hiding back-facing polys in the render settings. That isn't working because (1) sometimes it doesn't knock out all the right polys and (2) sometimes it knocks out too many polys.

Hi, maybe take a look at CyclesSurface + Holdout?
It will make a hole in the image where a mesh uses this material:

http://www.posersoftware.com/documentation/12/Poser_Reference_Manual/Materials/Nodes-Cycles/Shader.htm

Below applied to La Femme SkinHead:

Output as PNG:

Excellent. That's doing exactly what I'm trying to achieve but I was hoping to render it using Firefly for stylistic reasons. Any ideas?

Agreed, @evargas. Thanks for the help.

Yes, I see the problem. You want a PNG cutout from a 3D object. Here's the workflow.

1. Take a square-plane or box Primitive from the Poser Primitives folder.  Enlarge it and slide it into the mid-section of your figure and clothes, such that it hides the backs of things.

2. Make this Primitive a bright mid green color. If it's positioned correctly it will now hide the unwanted rendering of the 'back' of the hair and clothes (back straps etc).

3. Make the backdrop for the scene the same colour green.

4. Hide the body, so you just have clothes and hair.

5. Render to a big size, say 4000 pixels.

6. Use a good greenscreen 'knockout' tool on the render, of the sort the movie-makers use, to knock out all bright green in each render. This can be batched. I forget exactly what I used to use for this, but there are several. I seem to recall I may have used Primatte Chromakey for Photoshop.

7. A pro tool like Primatte will do a good job. But you may also want to defringe the result in Photoshop (Layer / Matting / Defringe). Again, the process can be made into an Action, and batched.

8. Copy the cutout to a new .PNG (with no wasted space around the edges, where the green has now become transparency) and save. You now have a cutout which shows no back-bits.