Working out of Brooklyns Gowanus neighborhood may have toughened up Vena Cavas Sophie Buhai and Lisa Mayock: Their signature pretty silk dresses got some serious hardware for spring. A fluid yellow dress, for instance, had metal triangles running up the straps and center, while a stunning floor-length cream silk skirt, with subtle kick pleats, was played off against a gray T-shirt and shrunken black leather vest. A collaboration with Via Spiga yielded sexy stacked heels glinting with silver buckles, which worked well with the edgier fare, such as a black mesh T-shirt paired with a rich orange long skirt suited for club-hopping. The designers, who each season get a bit more adventurous, not to mention adept with their draping, seemed to be offering urban princess-warrior clothes for their usually delicate fans.