Jacquemus' 'Yvan' trousers match the sandy cove of the Calanque de Sormiou, a private spot on the outskirts of Marseille where the label staged its inaugural menswear show. They're tailored from a light and breezy linen-blend and pressed with neat creases through the front. Wear yours with an unbuttoned shirt and a blazer slung over your shoulder, as seen on the runway.