The IDEAL bones for a Long Dress
Check out these dresses: http://www.renderosity.com/mod/freestuff/index.php?user_id=749857
They are for Victoria 4, not Genesis... however, what's amazing about these is that the skirt's bones are NOT attached to the HIP... they are attached to the ABDOMEN! And they work!
I put all three of the long dresses on V4, applied a smoothing modifier, and THEY WORK! Please check these out... IMHO, this is how long dresses should be set up... MFD Included. (I'd love to get the MFD settup with new bones like these...)