amazing picture firstly, one crtique is I would of had the model arch her back more, this is both a more seductive and meaningful pose and it would of dispelled the excess material on the clothing. But that is a small suggestion, you have captured it wonderfully!
It was a difficult balance with the pose, and I agree, it is isn't perfect.
We did try arching the back and it just looked oddly uncomfortable. We tried a few different levels of arching, and this one just seemed the most comfortable. I also didn't want to to be too seductive, as I was aiming for fashion and not too much glamour