LANVIN’S TRIPLETS: Lanvin opened its eighth store in the U.S. — and third on the West Coast — last week at South Coast Plaza in Costa Mesa, Calif. The 1,220-square-foot women’s store houses Lanvin’s ready-to-wear and accessories collections. The store has one main room with a salon area incorporating a black sofa, loveseat and coffee table at its center. Design elements that tie the space to other Lanvin stores worldwide are a parquet floor, an Art Deco chandelier, gilded mirrors, and metal and glass display cases. Lanvin’s first West Coast store opened on Rodeo Drive in Beverly Hills in 2011. Lanvin also operates two New York flagships; dual-gender stores in Chicago and Las Vegas, and women’s-only stores in Bal Harbour, Fla., and Malibu, Calif.