As slinky as it is dazzling, this one-shoulder long sequin prom dress is also affordable. At under $150, you can have this sparkly long evening gown that is fully sequined from the asymmetrical neckline to the floor. The one-shoulder long formal dress smooths over the curves before opening in a side slit for a sexy vibe at prom, galas, and other black-tie events. Showcase the silhouette while shimmering in the spotlight in this one-shoulder long sequin prom dress that is surprisingly budget friendly for your big night.