The only difference between Poser 4 clothing and the dynamic clothing in 5 is that some of the P4 clothing has caps. To explain, look up one of the P4 sleeves and on some you will see that its closed. This capped end will intersect the figure. This is not allowed in Poser 5 dynamic cloth because it works on collisions. If the cloth is already colliding with the figure then it throws it out of wack. So in essence any clothing may be used on any figure provided that at the zero pose no part is actually touching the skin. Now how well they will fit after draping is anyone's guess. It will be like wearing someone else's clothes.