Looking for a long evening gown or prom dress to show off your curves? Step into the 2017 season in one of these sexy mermaid style formal dresses. This is a sleek and feminine style dress that hugs your curves. Mermaid evening gowns follow your silhouette to the mid thigh or calf and then flare out at the bottom. PromGirl has this elegant style available in strapless evening gowns, halter top formal dresses, and designer long evening dresses for prom or pageant.