The Duchess of Cambridge has become a pro at dressing for the occasion. Case in point: this crisp nautical Jaeger frock, which she donned for an event at the Royal Maritime Museum in Greenwich, London. Kate Middleton looked as sophisticated as ever in the white and navy crepe shift dress, which she paired with Alexander McQueen suede pumps, a matching Russell & Bromley clutch, and delicate gold and silver jewelry.

The occasion marked Middleton’s first solo engagement following the Royal Tour, where she was on-hand to help launch Britain’s bid for the coveted 2017 America’s Cup. We love her ladylike-meets-effortless look, and so did everyone else—the dress has already sold out online.

Want more outfit inspiration from Kate Middleton? Click through our gallery to see her most memorable outfits ever!