Mermaid Trumpet Evening Gown Elegant Dress Formal Wedding Floor Grape Formal Dresses One Shoulder Trumpet Mermaid Long Formal Dresses With Slit Mermaid Trumpet Elegant Prom Formal Evening Birthday Dress One Shoul Mermaid Trumpet Sweep Brush Train Evening Gown Ball Gown with Overskirt. This elegant one shoulder formal dress is sure to make a statement. With a flattering trumpet mermaid silhouette and a daring thigh high slit, this dress is perfect for any formal event. The slit adds a touch of sexiness while the one shoulder design adds a unique touch. Stand out in this stunning dress and feel confident all night long.