You could commission PhilC to create an add on for G3F for WW. I haven't paid much attention to the add on products for G3 so I don't know if anyone has created a V4 clone for G3F. I'm sure if you ask over at the DAZ forums, they can point you to the right threads on creating various clones for the different figures. You would need to have DS installed. Once you have the V4 clone (if there isn't one already), you should be able to fit the clothing to the V4 clone and use the export functions to export the obj and the cr2 for the clothing item. The cr2 export function in DS isn't the best. DAZ pretty much stopped doing anything with once they created the DSON importer. There is an older tutorial over at DAZ that walks you through the process of getting Genesis into Poser via the cr2 exporter (this was before DSON). It has some helper scripts included.