Roger Vivier's pumps became an instant classic after Catherine Deneuve famously wore a pair in Luis Buñuel's 1967 film Belle de Jour - they've remained one of the house's most coveted styles ever since. Re-imagined in a backless silhouette, these mules have been made in Italy from glossy patent-leather and feature chic square toes embellished with the designer's signature buckles. Wear them with everything from skinny pants to formal dresses.