A few more notes about Jinny models:

1- They are tri-mesh and have typical node distance 20 mm. That is perfect for normal loose clothing.  

2 - The uv maps are flat (like pieces of fabric laid out on the tailor's workbench, prior to sering them together). The individual pieces may overlap, in particular if the garment is made of multiple garments, say sweater and pants.

3- The scale of the uv maps for with the same material is constant and coordinates are expressed in size of the fabric sample. Thus not constrained between 0 and 1.

4- The uv islands change with the grading (=fitting) of the garment.  If you let Jinny fit a skirt on a figure that needs 1000 mm of fabric to encompass the hip, the uv map will cover that 1000 mm on the fabric. For a figure with 800 mm hip that will be 800 mm on the fabric. Like in real life, a 25 mm checkboard pattern remains a 25 mm checkboard pattern irrespective of figure size.

So forget morphing etc. Garments are 'cut' to size for the figure.