http://www.smercure.com/tutorials_poser/ConformingClothing.htm
Okay, example is for Mike, but the recipe is generic P4, not even PPP / P5...
Put it this way, I think even I can follow it...
Best of all, it explains how to trim down a 'stripped' CR2, removing unnecessary actors, welds etc etc.
I am so glad I found it, I was starting to worry...