If you ask those who practice it, “Why skyclad?” twelve will get you thirteen you'll hear something along the lines of 1) energy flow, 2) social equalizing, and 3) a sense of separation from the ordinary.
Those may all be good answers, and they may even be true answers, but they're modern answers. They're not the answers the ancestors would have given.
If 1400 years ago you had asked a priest of the Hwicce tribe, “Why do you go naked to your worship?” had he been disposed to give you an answer at all he may well have said, “The Lady of the Hwicce instructed us so.”
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If only we would listen, indeed. Blessings.