It is the long gown from the Romantic nights set I sell at DAZ. It uses a variation on the system Anton K used in his Egyptian set, the entire lower part is hip mesh, it has ghost thighs and shins. It is sort of a complicated arrangement, but it does pose automatically, no need to apply the Pose to the dress or anything. I had to decouple the shins from the figure, and run them by ERC to get it to pose, otherwise they double the rotations. It also has effective fall-off zones, because of this it can't be sat in the regular way, I have an extra set of body joints just for sitting. Oh, did I mention it can be sat in, too? ;-) Like I said, pretty complicated, but most of it is transparent to the user. To sit in it the "normal" joints must be backed off, and the "sitting" joints applied manually, I furnish a sample set of poses (one for the figure, one for the gown), to show how this is done. All in all it wotks pretty good, so well that I'm using this system in most of my dresses, even shorter ones, it is in Glamorous Vickies dress as well, she can sit too!