Here's a gorgeous strapless long off-white prom dress 7434W by Ladivine. If you're looking for an affordable long white wedding gown or just looking for a sleek long white formal dress for prom, this strapless long white evening gown is simply gorgeous. With a ruched neckline, this strapless long white formal dress has a wrap-around corset that laces up over the open back for the best fit. The long mermaid skirt pools into a train to complete the look of this strapless long off-white prom dress that is affordably priced under $200 for the savvy bride.