My guess, simulate physics.
Now I am not a strong daz user, I wimp out and jump over to blender, which has a dedicated physics simulation feature. for daz I think you want to research into dForce, and from what I know you can by some assets that are dForce ready, so you could search about that and how to apply it to objects. From what I've experienced in blender, there may be some issues. For example, you can't just simulate a rubbery skin, put it on the character and expect it to just work. The alien shouldn't collide with the skin, rather using a simplified invisible 3D model to interact with the object. For things like a simplified hook for the fingers, and a simple pole for a head. To get the mesh to look like it is fitting, you just have to fade out the simulation effect. I know daz is powerful, but I don't know if it can do this. Blender can sorta do this. either simulating and baking in the simulation, but in reverse, or by using adjustable weight maps to control the strength of the simulation and the character skeleton's control.
