Emily Blunt took a unique Ferragamo footwear look to a New York City screening of “The Devil Wears Prada 2” on Wednesday, signaling the upward mobility of the deep-vamp shoe trend. Emily Blunt Aeon/GC Images Blunt, who returns as Emily Charlton in the long-awaited sequel releasing Friday, showcased Ferragamo ’s distinctive S-shaped mule heel in black patent leather, which features a sculptural heel and a high-cut vamp with a deep V-neck outline. Inspired by an archive style, the shoe is available from the brand for $1,150. Styled by Jessica Paster, Blunt wore the shoes with a Ferragamo look including a black patent leather knee-length skirt and a bright red chunky knit wool cashmere cardigan adorned with golden Gancini hardware. Left: A closer look at Emily Blunt ’s shoes. Right: Ferragamo S-shaped heel mule. Left:Aeon/GC Images. Right: Ferragamo Blunt wouldn’t be the first to embrace a deep V-cut shoe.…