Isn't Eva Mendes every bit the movie star? I love her throwback look: womanly sundress, nautical belt, cat-eye sunglasses, and a two-tone bag. It's all very Summer in the city . . . or St. Tropez. You may recall Kate Moss's cool two-tone shades not too long ago? Accessory designers are stepping it up, adding interest to classic-shape handbags. The dual color scheme can mean two things: preppy or edgy, choose your poison.