The cr2 you posted has additional bones in it, set up for erc to make it follow grandchildren (the thighs). There is a third bone to move the entire bottom of it as well.

You don't have to have geometry assigned to a bone to use it just for erc. That type of erc has been in use for a long time.

Since you are using 2012, you can set up a lot of that right in the program with the dependency editor as well.

You should be able to rig that entirely in Poser. The only thing you will have to do outside of Poser is change the 2 geometry lines after you are done so they point to the original geometry file.

None of this is a trade secret, there basically aren't any trade secrets in Poser.

Load that cr2 into poser and look at the hierarchy, then look at how the dependencies are set up.

If this is something you are doing for yourself, you could even strip out what you don't need from that cr2 (morphs, etc) and change the geometry calls to use your dress.

There are a few other ways of rigging it as well.

One way is to make morphs for the thigh movement, another way is to weight map it.

I strongly recommend you remove the file, you basically gave it away to anyone that downloads it.

All the information needed is in the cr2 to rig one that way, that is all you should have posted.

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