Here's an example of a shirt I did with an open morph, in the modeling program in wireframe mode.  The front of the shirt is modeled in separate pieces, even though it appears closed.  It needs to be modeled this way to create the morph to open it.

I understand the concept, what I'm asking is the overall workflow for building the .cr2 from those changes: I assume you export the mesh in a closed form first as the base .obj for the clothing, then model the top button open and re-export as the first morph, but how do you export that first morph's changes to a corresponding targetGeom section in the clothing's .cr2?