Hollister’s intimates line Gilly Hicks is finally branching out, starting with pop-up stores, as it builds out its expansion strategy over the balance of 2019. First up for Gilly Hicks are four pop-up locations–Tysons Corner Center in Tysons, Va.; Dolphin Mall, Miami, Fla.; Los Cerritos Center, Cerritos, Calif., and Baybrook Mall, Friendswood, Texas–that will test…