Velvi One-Sleeve Long Black Sequin Prom Dress RitaShine all night in this one sleeve long black sequin prom dress named Rita. From Velvi, this one shoulder long black formal dress is fully sequined from the asymmetrical neckline to the hem, while one long sleeve makes a bold fashion statement for prom, galas, and other black tie events. Offered in misses and some plus sizes, this long black sequin designer dress has a hip skimming long skirt with a thigh high side slit that creates a sexy vibe with