Plastic Tops (metal bottom). The hottest eye-wear fashion will be combination plastic/ acetate & metal frames. The acetate top gives a real vintage 1950's feel. Some are replicas true to the old day, while others pay homage but take it to another level: Pink acetate tops, unique shapes, sunglasses. Whether you're a purist or like an adventurist twist, these styles are going to stick around for a long long time.