GO, GO, GO FETHERSTON?: It seems like there's no stopping Target's Go International campaign these days. After recent guest designers Patrick Robinson, Libertine and Alice Temperley, word is the mass retail chain just zeroed in on Erin Fetherston for its next Go round. Details of the collaboration could not be learned, but the Berkeley, Calif.-born, Paris-based designer's collection could hit Target stores by fall. Fetherston, who is perhaps best known for her platinum blond hair with signature bangs, launched her own couture collection after studying at the Parsons The New School for Design affiliate in Paris but, after two years, shifted to ready-to-wear for spring 2005. She has shown during New York Fashion Week in recent seasons.