Strappy-Back Long Prom Dress: Amelia Couture 6131If you are looking for a strappy open back long ruffled prom dress that is as beautiful as it is affordable, this is it. From Amelia Couture, this elegant long formal dress is affordably priced under $100 but is an upscale design from the cowl neckline to the hem. The cowl neck long evening gown has thin shoulder straps that criss cross the open back before lacing up for the best fit, while the long skirt opens in a wide side slit before cascading to