If ya ever read any tuts on Dynamic clothin', I'm sure that you've heard that "pokethru is yr enemy". BAH!!! It ent good, but don' let it fluster ya. The important part I've found is to make sure ya have a "solid foundation" to yr cloth (I dunno if there's a specific term fer this). In this case, that would be the neckline & shoulder straps that "support" the rest of the dress. If this area is inside yr figure, chances are Poser will either stall, or yr cloth will fall right thru yr figure.
WARNING!
This user has been known to swear. A LOT!