Envision a fantasy-filled evening in this sleeveless long mermaid prom dress 370-1 by Amelia Couture. With a diagonal sash waist that offers a long, lean look, this long evening gown has a v-neck bodice with thick shoulder straps that lead to the matching v-back. In misses and some plus sizes, this beautiful long formal dress has a long mermaid skirt that smooths over the hips before jutting away from the knees to the horsehair hem. A small train finishes the look of this statement-making sleeveless long mermaid prom dress that is surprisingly affordable at under $100.