I had a similar problem with another item of clothing.  It turns out that in my case at least, when I tried to import it without V3,  Carrara could not properly adejust it's placement.  On a whim, I tried uncomforming the item from V3 and saving it alone again.  Without being conformed to V3 it worked.  Of course this did some weird things to the item's pose but I was able to convert it to the vertex modeler and redo the pose that way.  I hope this helps. 

Rich

PTW I use the PC version of C5 and P6 so it may not work for you but it's worth a try I guess.