One-Shoulder Long Cut-Out Prom Dress: Eureka 9986Sleek and sassy, this one shoulder long prom dress by Eureka is one you won't want to miss out on. With a one shoulder bodice, this long evening gown has thin bands that lace up for the best fit at prom, galas, and other black tie events. Offered in misses and some plus sizes, this one shoulder long formal dress has a slash style cut out at the neckline, while the long skirt has tummy camouflaging ruching and a wide side slit that completes the look.