Long Navy Glitter Prom Dress: Aerie Couture 239A gorgeous glitter print makes this long navy blue mermaid prom dress 239 an ultimate show stopper. Crafted in glittery dark blue fabric from the plunging v neckline to the hem, this long blue formal dress is the perfect balance of sparkly elegance and figure flattering style. In misses and some plus sizes, this navy blue long evening gown has thin shoulder straps that criss cross the open back for a fitted look at prom, galas, and other black tie