Cheap Dresses for Girls Online Shop Night Moves 7016 Floor Lenght Black Open Back Prom Dresses [Night Moves 7016] - This dress is a gorgeous dress just full of BLING! Fully sequined prom dresses are glitzy and fun, and sure does bring the glamour. The strapless bust has a sweetheart neckline, and the fit and flare style flatters all types of bodies.