*I use the old V3 cloths cos I can't find any that says for V3 SAE in the freestuff area. so, needless to say, I realize that the cloths I'm using aren't for this character.*

You don't need to use clothes made for V3 SAE. V3's clothing will work just fine. Or at least, just as well as it works on V3.

You may be having a problem because you're using free stuff. The quality of free stuff tends to be spotty. There's often poke-through when you pose. But this is not because you're using V3 SAE. It's because the clothing isn't well-designed.

Example above. Same pose, same clothes. One is V3, one is V3 SAE. Can you tell which is which?

Poke-through is a very common problem with Poser. Well-made clothing will be tweaked to minimize this problem. There might be jcms or other morphs that would help. (For example, if the top above contained breast morphs, you could probably hide the poke-through by dialing up the breast size slightly.)

The problem is not V3 SAE!