A budget-friendly option, this long mermaid prom dress will not go unnoticed. It's hard to believe that this exciting long evening gown that is crafted in rich stretch charmeuse fabric from the scoop neckline to the hem costs less than $200, but it does. Offered in misses and some plus sizes, this beautiful long formal dress has a mermaid skirt that smooths over the hips before ending in a small train. From Poly USA, this long mermaid prom dress looks like an upscale style for prom, galas, and other formal dresses, but allows you to strike an elegant pose without emptying your bank account.