TIESTO MAKES THE GRADE: Guess Inc. is moving its relationship with DJ-producer Tiësto a bit higher in its mix with a second, expanded capsule collection set to launch in Guess stores this May. The new Guess-Tiësto collaboration will grow to 35 pieces from 22 and, rather than simply the limited-edition watch offered when the partnership was forged last summer, will be supplemented by a growing range of accessories, including sunglasses, such as an oversized aviator; casual footwear for women and men, and a new watch, too. “I learned so much from the first collection and put all that experience into the second collection to create amazing new pieces,” the DJ said. Guess is also on board for more Tiësto performances, beginning with one in Dubai this Thursday.