first of all, i don't think any of that content allows commercial use at all, let alone selling an edited copy.  second of all, what you'd need to do is change both the shape and the rigging.  there are several programs that either do this automatically, or help with it.  if you want someone else to do that, they would have to get the rights to do it and give it to you.  most people who can would rather just make their own clothes.  if you want to do it yourself you can use either Wardrobe Wizard (which comes with Poser 8), CrossDresser by EvilInnocence, or OBJ2CR2 by PhilC, and some form of morph tool (like the one in Poser 7 and up).  there are probably some other solutions, but those are the most common.