Zachary Cole Smith opens the door wearing a collarless white button-down shirt so big it could pass for a nightgown. The 28-year-old DIIV frontman is also rocking a leather ball cap over his light brown shoulder-length locks, plus baggy white shorts and black low-cut shoes with tall black socks climbing up his calves. Short, slight, and boyish in the face, he looks like a kid dressed up as a 19th-century baseball player for Halloween. It’s about 10 o’clock on a seasonably hot July Monday night. We are on the sidewalk in a vaguely defined area of Brooklyn between the heavily gentrified Williamsburg neighborhood and the increasingly gentrified Bushwick. Across the street in a warehouse decked out with colorful murals and gym mats, a group of men are breakdancing. Various musicians have been coming in and out of the graffiti-strewn brick structure Smith just emerged from, one of those industrial buildings where bands rent out space to practice. DIIV are borrowing a room from their buddy Matthew Molnar of Friends for tonight’s rehearsal.