photo courtesy WWDWhat's as important to an Olsen as leather jackets and white t-shirts? Sunglasses, duh. The twins, who've grown Elizabeth & James with shoes and jewelry this past year, are ready to expand The Row. Instead of starting with bags or accessories, they've done sunnies. Mary Kate told WWD, "Designing eyewear was definitely more complicated than we thought, and of course we wanted to be extremely hands-on." But they did manage to choose four frames, including the ones at left, in collaboration with Linda Farrow. They'll launch this spring, starting just under $400, and sell alongside the twins' clothes at Barneys and Bergdorf.