Here's a long black sequin prom dress that shines for the spotlight. The dazzling long black formal dress is fully sequined from the halter bodice to the hem for a sensational look at prom, galas, and other black-tie events. From Mac Duggal, this long sequin designer dress smooths over the curves, while long skirt has a side knot detail and a thigh-high slit that opens before reaching a dramatic floor length. Offered in misses and some plus sizes, this long black sequin prom dress is sure to capture the attention of the crowd.