Ever since Rodnik designers Richard Ascott and Philip Colbert showed up on the fashion scene 4 years ago, selling delicate Russian scarves and twirling parasols, they've been one of fashion's coolest pairs. And now they're even cooler-- Because now they're rock stars. The Rodnik duo is in New York, gearing up for the first show of their We are not a rock b(r)and World Tour. They'll be playing this Saturday, 2 pm, on the Barneys 8th floor. Phil will be doing vocals and Rich will be drumming. The songs? A collaborative effort, with a fashion focus. If you aren't in New York, Rodnik may soon be coming to your town: they're playing shows this fall in London, Milan (at fabled boutique 10 Corso Como), Paris, LA (at Maxfield), and Tokyo (at the Comme des Garcons store). Rock on, Rodnik! --ANNA FIELDING GRIGGS, whom you can see with the Rodnik boys at left!