How to make good JCM with MD?

killercow

I`m trying to make JCM with MD. I'm doing pJCMAbdomenFwd_35 and with only this one morph it looked great, but in any other position it has ugly poke through.

I wached tutorials, but everyone explain how to do one hand morph or one leg in pants, but no one explain how to make skirt with both legs used.

Can anyone pls help? or nudge me in right direction? Is it even posible at all?

 

pictures: 

1 - without custom JCM

2 - with custom JCM

3 - different pose (Base Pose Sitting B from base poses)