Oh, one other thing I forgot to mention. Your corset will need to have "parts" assigned to its sections that match the V4 parts in name and placement.  

For some reason, Hexagon (an otherwise capable modeler) doesn't allow you to create parts. This leaves you with the option of using uv mapper to assign parts or trying Poser's "autogroup" feature. 

Someone else will need to explain how these work. 

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