Mermaid dress is very tight on the top and through the hips. After the hips and around the thigh to knee area, the dress then goes out, like mermaid fins. A mermaid dress is also known as a trumpet dress due to it’s flaring style at the bottom. Mermaid style a variety of different necklines and styles for the top half of the dress. They can be sleeveless, halters, spaghetti straps, and even short sleeves and can be made from a variety of fabrics. They can be slinky silk dresses or th...