Here's a long prom dress that will make your evening out a memorable one. Glamour and curve-hugging allure are yours in this slinky princess-cut evening dress. Under $200, this affordable long prom dress has a deep v-neckline with trendy double spaghetti straps. The open-back mermaid dress showcases your contours before flaring out to skim the floor. In wrinkle-resistant scuba fabric, this open-back formal dress will look as fresh and beautiful at the end of the evening as when you first slipped it on. A worry-free night is yours for formals or prom in this sleek easy-to-wear long prom dress that is sophisticated yet budget-friendly.