bareskin

Not wearing clothing; not covered by clothing, hair, feathers, etc.

A bare-skin boy did guide my feet— A boy with pretty, pouting ways: And oh, ’twas shrewd deceit!

1931, Hugh Walpole, Judith Paris, London: Macmillan, Part 2, “The Clipping,” p. 356, He sat there thinking of his youth, of fighting a man bare-skin in White haven and throttling him […]

In which participants do not wear clothing. (of an activity or event)

1911, Mrs. Todd Lunsford, “As the Twig is Bent,” Kindergarten Journal, Chicago Kindergarten College Alumnae Association, Volume 6, No. 4, p. 141, After your babe’s next bath, put him freely on the bed still in his birthday clothes […] I happen to know one mother who has made daily practice of this bareskin play with her youngest child.

1942, “Campus Caravan,” The George Washington University Hatchet, Volume 39, No. 14, 15 December, 1942, p. 2, […] the WAAC, A.W.O.L. from Ft. Des Moines, who was found doing a bareskin act in a local burlesque, was a misguided miss who had taken these Navy “Strip for Action” posters too seriously.