Denim-loving residents of Barcelona — many attending the Denim by PV fair, held at the Montjuïc exhibition center in late November, others spotted on Passeig de Gràcia and Plaça de Catalunya — channeled a mood indigo. Ripped jeans, classic button-down shirts, quilted and zippered jackets, and variations on the jumpsuit were the favored items, often paired with leggings, retro sneakers and Dr. Martens.