Out of curiosity, what's with the general dislike for JCM?

Corresponding JCMs have to be put into conforming clothing, whilst the weightmapping simply goes in with the rig. JCMs have their uses, as weightmapping (at least Poser's weightmapping) only moves vertices in a direction normal to the surface, a restriction JCMs do not have.....

Note that corresponding weightmaping also has to be in the clothing. 

Indeed, but that is transferred when the figure's rig is added to the cloth, at least in Poser...

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