That has been my basic experience with Morhphing Clothes, too.  It gives pretty good results, but I've never been able to get it to port the ERC correctly.  In some areas where the target mesh may be too different from the source mesh, the transferred morphs may need some extra work, in my experience.

It's a wonderful and amazing tool, though, that can take the process as far as this!  :woot:

And the t-shirt conversion is looking good!  :thumbupboth:

 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.