I then imported the chain into Poser and clothified it with the links assigned to the soft decorated group and draped it over a cube primitive to get the ends hanging down at the correct distance apart (Shown in mid-air in front of the figure)

This was exported as a new obj and re-imported into Poser. After flipping it upside down and positioning it as shown it was clothified as before and a few points at each end assigned to the constrained group. The cloth density was set to .1 for faster draping.