You're right
The idea is to catch the body's flow while the woman walks, thus creating a soft moving picture of her torso in the viewer's imagination. The drape is also very flattering on a seated figure.
The illusion also depends on the weight and opacity of the fabric. A silk, or a fine cotton or light satin overlaid with chiffon, achieves this effect without the transparency factor that one finds in another garment of a similar cut: the negligee.
Unfortunately, when standing still, the woman is wearing a tent. This isn't a good standing-up dress.
I have suddenly become a fashion commentator. Hmm.
Regards--
Mary Anne
