I suppose it would be possible, but with some work. Here is how I'd do it.

• Have the normal suit up to the point where the tearing would start
• Export that posed mesh, and manually tear it in 3rd app polygon editing software (Silo, Blender, Wings3d, etc), being careful not to edit the material groups. Remember to exported as a welded single-polygon-mesh. That is to say, it should look identical, but where the tearing occurs the polygons are not welded but the edges overlapped.
• Import the result to Poser with all the radio buttons unselected.
• Apply the materials from the original suit
• Take the suit to the cloth room, and set up the simulation to start just when the tearing starts. No posing should be necessary, as we had the original suit for that part.
• Tweak the cloth sim to death. This would depend on how the suit's been modeled as well as just how you want the tearing to look like. If there are overlapping polygons in the original mesh, it will be quite time consuming, as the cloth room does not like overlapping polygons.

Personally, for a task like this, I'd model/texture/etc my own business suit to be "tearing-and-cloth-room-friendly"

Or you can do the tearing thing in Houdini and import into Poser the result with the mdd plugin http://www.vuescripts.com/_A/index.php?id=1,0,0,1,0,0

The Houdini way is probably easier... if you know your way in Houdini...

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