Mermaid wedding dresses are more in fashion than ever. As seen on the couture runways and the red carpet, they can come in assorted fabrications, colors, and styles. A mermaid wedding dress, a silhouette type, is a slim fit wedding gown that has a dropped waist all the way to the knee. At the knee the dress flares out with volume all the way through to the hem. They are considered glamorous and extremely flattering.