Thanks, Tony. That is immensely helpful! I almost feel like I understand where the stuff is going now.

So, when I went back and did 'spawn prop' in the fitting room, I did end up with a prop that could be saved in the prop library. The problem was... when I added it back to my figure (for whom it was designed), it no longer fit... It was slightly off - possibly a slight rotation off even. Not sure why it did that. So far, for me, the conforming clothes seem to work better - though I'm not totally sure why.

Now, I need to add a second piece of clothing... In this case, I started with a pair of capris for Ryan. I then added a shirt which would overlap with the capris slightly. I can't use the fitting room to make it fit to Ryan (because then it doesn't fit over the capris - even when I go back and conform it to Ryan) and I can't use the fitting room to make it fit to the capris (as there is nothing inside... it went all weird.) Even after listening again to the Poser tutorial on the cloth room, I haven't the faintest idea how to handle a still object in there... 

How do I go about adding the second piece and have it work?