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The judging panel included designer Antonio Berardi, milliner Phillip Treacy, designer Roksanda Ilincic, editor Lucy Yeomans and editor-at-large Kim Hersov.
"Catherine's incredible style evolution has gripped us all," Yeomans wrote. "She gave us the year's—if not the century's—most thrilling fashion moment at the royal wedding, and is shaping up as an amazing ambassador for British designers and the high street."
Taking the title was no easy feat for Her Royal Highness, considering the bevy of chic British beauties who were also in the running.
Do you think Duchess Catherine deserves to reign at the top of this list? Weigh in below!
PHOTOS: Fashion Spotlight: Kate Middleton