The dress is the "sappho" by Kambriel.
I was in San Diego recently, borrowed Click Hamilton's studio and temporarily became part of the endless whirlwind that is Click's life. Sinned-angel-stock came by to pose for some arty stock as a goddess figure, rocking schoolgirl guitar-player, and (of course) a cat-girl sharpening her claws on Click's favorite chair. I'll post some of the stock in my stock account eventually.
Natural light and almost no post-work. The softness of the image is actually slight blurring from hand-holding the camera and the motion of her clothes and hair from a large fan that was blowing in her face.