What boots did Catherine, Duchess of Cambridge choose to accessorize her L.K. Bennett coat in Denmark yesterday? Stuart Weitzman! The knee-high suede "Zipkin" style features a 4½-inch heel and a graphite zipper that extends from the footbed to the top of the boot. The brand only offers this shoe in two places, InStyle.com confirmed, Russell & Bromley in the United Kingdom (where the Duchess bought them) and zappos.com. Shop the style, available in sizes 4 through 12, for $635 online, and see more photos of Kate's look in the gallery.