Rooney Mara in Balenciaga

Rooney Mara in Balenciaga. Photo by Getty Images.

Who: Rooney Mara

Where: The premiere of her new film “Trash” at the 2014 Rome Film Festival.

When: Saturday, October 18th

What: A black two-piece from Balenciaga’s Spring 2015 collection and sleek pointed sling-backs.

Why: With a bare midriff and sheer panels in her signature shade, this look combines all of Mara’s trademarks, and may be her best yet.