A classic style with sultry details, this long mermaid prom dress is a beautiful option for your formal event. The curve-hugging satin evening dress features a deep v-neckline with an illusion inset for added support. A princess cut visually slims and elongates while the open back feature adds a steamy look on this long satin dress. The glamorous mermaid skirt flares away from the unique drop waistline before flowing down to a romantic floor length. In misses and plus sizes, this long mermaid prom dress, under $200, is an upscale style without the high price tag.