noun - Skinny dipping or a skinny swim is the practice of swimming naked, whether in open bodies of water or swimming pools. Today, most nude swimming takes place in private swimming pools, at nude beaches, at naturist facilities, or at segregated public swimming areas. Some countries of Europe have no laws prohibiting nude swimming in public areas, but other countries around the world strictly enforce various laws against public nudity, including nude swimming.
Naked swimming is the act of swimming in open bodies of water without a wetsuit or any non-neoprene swim cap. In the open water swimming community, a naked swim is not skinny dipping; rather it is performed with a porous swimsuit, goggles, and possibly, a swim cap and ear plugs.
Skinny dip was first recorded in English in 1947.