Standing side-by-side on Prince Arthur Street, Duo (24 & 30 rue Prince Arthur Ouest, 514-848-0880, boutiqueduo.com) carries collections from European design houses like Balmain, YSL, and Lanvin as well as American designers like Marc Jacobs, Rag & Bone and James Perse. The men’s boutiques offer two distinct feels with the 24 Prince Arthur location having a dark theme and 30 Prince Arthur having a white theme for its interior design.