I have a similar requirement for G2F and V6. How about some decent historical gowns for them? Something along the lines of Cute 3D’s My Princess, Princess and Queen gowns. There are literally dozens of gowns like this available for V4, not just at DAZ but at Renderosity and RuntimeDNA as well, so there’s clearly a big market out there for this kind of stuff.
Yes, I have heard of autofit and there are a couple of products from Sickleyield. They all make a gallant attempt at taming ankle-length gowns but I have yet to see a product that will perfectly fit a V4 gown to G2F/V6. (I believe this is due to the difficultly of rigging very long gowns.)