La Femme Strappy-Back Long A-Line Prom Dress 32200Silvery sequins make this long lavender a line prom dress the ultimate show stopper for the big night. Whether you're going to a military ball, a fancy gala, or prom, this long purple designer dress is ready to shine with silver sequin embroidery from the v neckline ot the hem. The long lavender formal dress has adjustable shoulder straps that lace up over the open back for the best fit, while the long a line skirt sparkles with every move you make.