“A reality show about fashion?? That sounds horrible!” Tim Gunn shared his famous last words with a packed auditorium last night at the Corcoran, a nostalgic homecoming for this former student and administrator of the school. I’ve yet to meet a Project Runway fan who doesn’t adore Gunn and his witty mentoring of the show’s designers, and his lecture did not disappoint. Though some listeners may have been slightly disheartened to hear very few words…