Ask any red-carpet vet or model who knows her way around a pose. Nothing gets the flashbulbs popping quite like peering over the shoulder of a dramatic open-back gown. Lately, designers have been translating that idea to daywear, adding interesting details to the reverse side of looks that are guaranteed to turn heads in the streets. Alexander Wang’s debut Balenciaga collection included a slinky split-back number paired with a sporty bandeau top underneath, and feminine knots adorned the rear views of LBDs in the Resort lineups from Nina Ricci and Burberry Prorsum. On Raf Simons’ Dior Couture catwalk, meanwhile, all eyes lingered on the unexpected, contrasting straps that delicately crisscrossed the models’ jackets as they slunk back down the runway. Talk about a grand exit.