What I have done in the past is load the prop to the figure. I pose the figure and export out the body part the prop is on and the prop itself. For example; the watch is on the right wrist so I would export out the right arm and watch in the posed position. Then I go into Hexagon or Silo (depends on my mood) and 'lock' the arm so I don't make any changes to it and I re-sculpt the item to fit more natural to the arm. I make sure I don't add or delete any polygons or vertices so when I'm done I can export the sculpted item back out (just the prop) and I load that into Poser as a morph. So then in my original scene I can dial the morph on the prop and it fits nicely to the figure.

If the prop is going to be on the figure in several different poses than you would have to repeat the process of course and that can be time consuming. You can do the same for clothing as well. 

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