Mermaid gowns. They are the most liked design. Mermaid gowns and dresses have a design of fitting to the body and the torso and then flaring down with a fishtail design. Mermaid gowns are mostly confused with trumpet gowns since they resemble each other. The difference is where the flare begins. Trumpet flare begins on the thighs while mermaid flare begins below the knees. Finally, most mermaids gowns do not have long trains. Rent one today. Also, enjoy a free tiara. Browse through the accessory catalog. Rent one and as a result, get the free tiara.