New York's unseasonably cool summer has finally thrown down a week of humid, makeup-melting days. That didn't stop Rose Byrne from test-driving one of fall's much-noted looks, the bold shoulder, Tuesday night at a Brooks Brothers-sponsored Cinema Society screening of her new film "Adam." While fellow attendees like Eva Amurri and Charlotte Ronson went the sleeveless route, the slim Aussie worked a baltic blue lace, mock turtleneck dress by Christian Cota with a structured shoulder, accessorized with Brian Atwood patent leather heels and Bottega Veneta fine jewelry and clutch. "I find Rose to be captivating: she always gets me emotionally involved with her characters," says Cota of Byrne. "She has that special combination of delicate beauty and strength."

And, apparently, a taste for resourceful style: the frock is from the archives of Cota's fall 2008 collection. Which proves that shopping your wardrobe and staying on trend is possible -- though it helps if that closet belongs to a fashion designer.