The Mexican Tourism Board might want to enlist Alber Elbaz to help bring vacationers back. Walking editors through his delightful Resort collection, the Lanvin designer cited Acapulco as an inspiration. You could see it in the lime- and watermelon-wedge pendant necklaces, the straw hats decorated with tropical fabric flowers, and the raffia-accented flats, as well as in a long blue silk sarong that had the easy sensibility of a bedsheet a honeymooner might wrap herself up in post-"siesta." A slouchy T-shirt and cropped, sequined pajama pants topped by a full-skirted, crinkled trench made for a look that was just as nonchalant, if a bit more citified. In fact, Elbaz thought of everyone this season— beachcombers, urban sophisticates, even brides-to-be—because alongside Resort, he showed user-friendly capsule collections of denim, long dresses, and ready-to-wear wedding frocks.