We're not really sure what to call this trend.
Natalie Portman (in Rodarte) and Marion Cotillard (in Chanel) both have dresses that are flanked with draped fabric.
We're sure there is a technical term for this type of garment but we sure don't know it. The fabric panels create an ethereal look and when they extend longer than the hemline of the dress (like Marion's), the effect is quite unusual and striking.
Natalie's photo via instyle.com.