This long off-the-shoulder black prom dress is a sleek and stylish choice for prom 2018, a formal, or a black-tie gala. Black is always in style, and this floor-length formal evening dress proves why. From the ultra-trendy off-the-shoulder neckline to the alluring side slit, this long prom dress is a surefire way to demand attention. The off-the-shoulder neckline features a fold over collar and banded sleeves. Crafted from a spandex-jersey blend, this long princess-cut evening dress cradles the curves and helps highlight the shapely silhouette. A removable choker collar and the thigh-high side slit take the sexy vibe up a notch. Priced under $150, this off-the-shoulder long black prom dress is perfect for stealing the spotlight without breaking the budget.