So, I've achieved my first conforming piece of clothing for Antonia today, which may inspire hope that one day she might have a proper wardrobe. It's all quite easy at the end with the fitting room and the morph copying function, but it seems that the secret lies in how on prepares the meshes. Also, perhaps not too surprisingly, I've found that the JCMs in the original Antonia 1.2 do not transfer well and so went with Antonia WM instead.

That said, it's possible that Poser simply does not transfer all the ERC setup for the multi-stage JCMs correctly, which require a special fixed channel with a constant value that maybe the code did not recognize as important. So at some point if I find myself in need of complicated ERC setups again that I want to transfer onto clothing, I might try to dive deeper into this subject.

Anyway, here is my excessively topless test image for the new conforming figure:

-- I'm not mad at you, just Westphalian.