Here's how I've started using Blender 2.77 to paint layers in 3d or 2d that can be exported as PNG files with transparency.
In this example I'm creating a layer so that I can add make-up to HiveWire3d's Dawn figure with Alpha and so that I can have a separate image of just the make up and not have to paint directly onto the skin texture itself.
A new script has arrived that lets you take non conforming clothes, props or just imported obj format models in Daz Studio and turn them into dynamic cloth items compatible with the optitex plugin in Daz Studio.
Here is a early test on a basic dress modeled for Dawn.
To make the cloth dynamic here I imported the dress obj, selected it and ran the script which then made a dynamic version. The original was then deleted.
It just outputs basic dynamic cloth version with no optimisations but sometimes thats good enough, maybe not for animations (see video) but I'm thinking it may help in clothing creation as its faster than Blenders cloth sim (for me anyway)
For more options you could use the Dynamic Clothing Control plugin for Daz Studio
The script to make dynamic cloth in Daz Studio is available at Renderosity