or you could just load the obj file for the skirt that exists in the geometries folder.

you don't have to worry about welding if you make things constrained.  of course, then that part won't drape. 

if you have wardrobe wizard, i'm pretty sure you can use it on dynamic clothes, too. iirc, you can convert props, too.  if you don't know how to use dynamic clothes, you might not want to start by using dynamics to fit a new figure. 

WW can convert a figure to a prop, and a welded (again, iirc- i'm not at my Poser computer)  prop at that.