For shirts and giggles I rebuilt a prim chair of mine in a 3d app and exported it to OBJ and into Poser. That way I can be more sure that my pose fits my chair properly. At least you'd think.
Something about the export/import has the chair coming in a little too large. That doesn't concern anyone here, but it made me wonder--my avie is at 83% height on the sliders. Is the SL Avatar Mannequin set for 50%? On the basis of guessing 'yes' to that question, I'm going on to create a pose by eyeballing how big to make the chair.