Silky smooth, this one-shoulder long white sequin prom dress is a slinky style that the crowd will love. From the designers at PromGirl, this sparkly long formal dress features iridescent sequins from the asymmetrical neckline to the small train. The gorgeous long white designer dress features a one-shoulder bodice with thin shoulder straps that sweep diagonally over the open back, while the long skirt opens in a side slit before ending at the floor. Offered in misses and plus sizes, this one-shoulder long white sequin prom dress is as luminous as it is figure flattering.