I have been wondering on this question for a while now.

MoClo is able to push figure morphs into a cloth.
PML is able to express poses as morphs targets (you can pose a figure, export this as a .OBJ, and load it as a morph target into the zero posed figure).

So, if PML is used to create a FBM that brings a figure into the exact shape it usually reaches through bending, and MoClo could work on this FBM, could MoClo create a good JCM for it?

Could this work? If yes, one could automate this to process a set of poses automatically.

I am out of time to try it myself, so maybe someone in these forums could comment or try?

MoClo ? Do you mean this one ?  http://www.renderosity.com/mod/bcs/index.php?ViewProduct=64629&vendor=288865

Does Morphing Clothes set up completely new ERC for morphs, if desired?  I thought it only transferred ERC for morphs which already had it, in the source figure. 

I do not own the program. The question of ERC setup is another topic.
First step would be to generate JCMs.

I understood MoClo it could analyse the position/distance of the cloth to the body in zero pose.
Then you morph the Figure, and the cloth is morphed accordingly.
If you have a morph in the figure which gives it the shape of a pose, then the cloth might be following the pose?

 Morphing Clothes does more or less what The Tailor did - only a lot better (or maybe it is just me, I never had much luck with The Tailor) It transfers morphs from the base figure and onto the clothing by some clever approximation method.

Since I have both programs AND a piece of clothing with a wonky joint, I'll try this out over the weekend and see if it is indeed the Solution to this annoying problem :)

I hope it is.

Maybe try just PML first. The technique I have in mind is a bit tricky, and might or might not work.