Attached Link: my favorite cloth room tutorial

The Cloth Room isn't that difficult, and doesn't take that long to render. Hair takes a lot longer. However, I'm not sure it will give you what you want. Parrish's "Ecstasy" isn't really a natural depiction of cloth. You can get some nice effects in the Cloth Room, but the flowing, romantic look you're after is probably best achieved with some postwork. There are many tutorials on painting clothing. Check them out. That's how the best Poser artists do it. Start with one of those "fiberglas" Poser dresses, then postwork the flowing folds over it.