Long Blue Sequin Prom Dress: Blondie Nites 4793BNGet ready to sparkle in this lace up long royal blue sequin prom dress by Blondie Nites. With sequin floral designs from the scoop neckline to the hem, this long blue formal dress shimmers with every move at prom, galas, and other black tie events. In junior sizes, this long blue evening gown has thin shoulder straps that lead to the horizontal band that laces up over the open back, while the long skirt opens in a side slit before ending at the floor.