I'm not sure if this is the right place to put this query but as the problem is manifesting itself in poser I'd thought Id put it here, 

I have made this in hex2 and used the autogroup editor (markdc) and tool collection specifically concloth (dimensions3d) and get this....

The problem happens when i conform the item to v4.2  and worsens when i pose her, Ive made a few items for mavka and never got this sort of problem but it happens with v4.2, in the set up room the shin bones are missing.  IVe tried adding bones for shins in the set up room but it makes it worse, (im not very good with the rigging hence the cheats tool above  :)

Can anyone suggest a remedy?

Ta in advance

Tools:- Win10, Dell XPS8900, ZBrush, Marvelous Designer 11, Hex 2, PSP8. PSP 2019 Ultimate, DAZ Studio, Affinity Photo, Affinity Designer, Filterforge 11, flowscape,  Classic UVMapper, and several headache tablets.