Feathers are lending a touch of exotic whimsy to the fall collections. Sari Gueron added edge to her sweeping black evening gown with tuffs of black feathers at the neck and hemline. Thakoon punched up his cocktail attire with a feathered knee-length skirt. Marchesa’s plumage — the most understated — was offered along the bust for a beautiful, swanlike effect. And while Rock & Republic’s Muppet dress did offer an entire skirt made of peacock fringe, it’s good to remember less is more.