Bar-code:i will follow yours suggestions next time
Hello PhilC This was an exception Your soft is fantastic Many clothes converted this afternoon were ok
For the problem .In cr2 (at left) some part of the skirt (one with a cercle) are not suppose to be there 
At right you will see the geometry produced by WW2. It is correct without the part in front  like the one you see in the render from Cr2 conformed on V4 (at left)

Sorry if my explication aren't enough clear .I am a french speaking person and i don't find  always the  correct words in english