Mermaid suit
From wipipedia.org
A mermaid suit is a zentai with only one leg. The wearer's legs are thus held together as in a mermaid's tail.
In use, the leg bondage may be reinforced by ropes, a leg sheath or other SM equipment over or under the suit. However, purists object to this as it is thought to spoil the sleek look of the trapped legs.
