Oscar Fashion: Jessica Chastain's Stylist on Her Copper Armani Prive

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Jessica Chastain, recently announced as the brand ambassador for Yves Saint Laurent's new scent Manifesto, did not wear YSL -- as some had surmised -- on the Oscar carpet.

Instead she stepped out wearing a shimmering strapless gown by red carpet staple Armani Prive. Her stylist Elizabeth Stewart tells THR exclusively, "We loved how the copper underlay picked up on her hair color." 

"It's old Hollywood. It’s a very 'Happy Birthday, Mr. President' dress," Chastain explained to E! host Ryan Seacrest. 

Adding to the glamorous look was a 1940s-inspired, Veronica Lake-esque loose, wavy hair style and a Harry Winston bracelet from the 1960s.