*What I don't understand is how to duplicate DAZ's morphs exactly - so that the clothes fit exactly.  I understand how to make a morph, but I don't understand how to make a morph that will match Daz's morphs.

*The morph does not need to be exact, as long as the figure doesnt poke through thats close enough. Of course you want to try to get it as close as you can . The way to do that is to apply the morph to the figure , and export that as an obj file. You can then use that obj file as the template for your morph. Thats a bunch of figures to export but you only need to do it once. Some modellers would let you create a template figure with morphs but thats going to depend on what program you are using.

If you look at some clothing items its some of the Full Body Morphs that the cloths get, not every morph for every body part. *