The Interpretive Dance Suits were used by the Bears as Shush Ninja suits. They were used as costumes by the Bears so they could disguise themselves while they shushed everyone in the cinema block. They made their first and only appearance in the episode "Shush Ninjas".
The suits are black, spandex body suits for the Bears' interpretive dancing class.
They had been brought to Cinepia with Panda when they went to see a movie. After leaving the cinema block, Panda pulled them out and got the idea to use them as disguises so they could quiet down the people in the theater. They were then known from then on as the Shush Ninjas.