Elisa Sednaoui

Elisa Sednaoui. Photo by Getty Images.

Who: Elisa Sednaoui

Where: The premiere of “Under the Skin” at the Venice International Film Festival.

When: September 3

What: A color-blocked Stella McCartney gown from pre-fall 2013.

Why: It takes a lot to upstage Scarlett Johansson, and that’s exactly what Sednaoui accomplished in this multi-colored dress. Her simple hair and makeup let this bold number take center stage.