Here's an upscale long prom dress that is as sleek as it is beautiful. Crafted in curve-hugging lycra fabric, this plunging v-neck long formal dress from Amelia Couture features a matching deep v-back and a stylish ruched sash waist. In misses and plus sizes, this classy long evening gown has a hip-hugging long mermaid skirt that gently flares away from the knees before reaching the structured horsehair hemline to complete the look. Affordably priced under $200, this slinky long prom dress is sure to turn up the heat without breaking the bank.