Strappy-Back Metallic Prom Gown: Mac Duggal 27061Wow the crowd in this strappy open back long metallic prom dress 27061 by Mac Duggal. Crafted in gleaming metallic fabric from the square neckline to the hem, this long formal dress is an eye catching choice for prom, galas, and other black tie events. The long metallic evening gown has spaghetti straps that criss cross the open back before lacing up for the best fit, while the hip hugging long skirt pools into a small train that finishes the design.