The term originated in the first half of the 20th century from skin (skinny) and taking a dip (dipping)...thus only your skin going into the water, no clothing...
I must admit, it was a little naughty of me but I did enjoy taking a peek...AT GOOGLE, since that is where I found this info for you :P
Cheers! And remember, "Nightswimming deserves a quiet night" (Berry, Buck, Mills, Stipe 1992)
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Jay R. (Westwood, MA)
"Faithfully losing the ice-out contest since 1975"
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