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It's obvious why GUESS by Marciano tapped Elin Kling of Style by Kling for their first-ever designer collaboration. The Swedish tastemaker puts together inspirational ensembles on a daily basis and her trademark, effortlessly chic sensibilities have earned her countless devoted fans. In honor of this exciting design match-up--all 35 pieces are available online today!--we asked Kling to reveal her fall wardrobe essentials. The list was exactly what we expected: a mix of sleek, subtly sexy, and completely cool items. Check out all of her must-haves here.