I think you're asking 2 different things (?)

First, you need to group and rig, or conform the clothing so that it moves with the V4/M4 figure. That's what the figure setup tools are for. I'm afraid I can't help you too much with that as I've yet to actually use them myself.

AS to Texturing, you need to make what's called a UV map. Basically that tells Daz exactly how to apply a texture map to the object. Think of it like wrapping a picture on a chickenwire frame. For that you need a separate program, such as UV mapper. Although I believe Blender UV maps. There's no one click solution to making a uv map. Personally, I hate making em. I'd recommend looking in the Blender forums for tutorials on how to UV map with Blender.