Gardner's Witchcraft Today was published in 1954. The book claimed to report on the contemporary practice of Pagan religious witchcraft in England, which had supposedly survived as an underground religion for centuries. Ritual nudity was included as a regular part of Wiccan practice, and remains associated with Gardnerian Wicca. THE "CHARGE OF THE GODDESS", a part of Gardnerian ritual liturgy, instructs Wiccans to practice ritual in the nude. Gardner spent several years in India, and may have picked up the concept from the Digambara Jains, a religious sect in which the monks may not wear clothing.
The origins of this instruction have been traced to Charles Godfrey Leland's 1899 book, Aradia, or the Gospel of the Witches. The following speech by Aradia appears at the end of the book's first chapter;
And as the sign that ye are truly free,
Ye shall be naked in your rites, both men
And women also: this shall last until
The last of your oppressors shall be dead;
Dr. Leo Ruickbie also notes that the traditional and artistic representation of witches cannot be overlooked as a source for nudity in Gardner's system, citing artists such as Albrecht D"urer and Salvator Rosa.
DOREEN VALIENTE, ONE OF GARDNER'S PRIESTESSES, recalls Gardner's surprise at Valiente's recognition of material from Aradia in the original version of the "Charge" that she was given. Valiente later rewrote the "Charge", preserving the lines from Aradia. Valiente's version was then widely circulated and reprinted.
Accepting Aradia as the source of skyclad practice, Robert Chartowich points to the 1998 Pazzaglini translation of these lines, which read "Men and Women / You will all be naked, until / Yet he shall be dead, the last / Of your oppressors is dead." Chartowich argues that the ritual nudity of Wicca was based upon Leland's mistranslation of these lines by incorporating the clause "in your rites".
RITUAL NUDITY IS NOT EXCLUSIVE TO TRADITIONAL WICCA. Amongst those groups that do, only some rituals may involve ritual nudity. The Arician tradition, as an example, practices skyclad for six months of the year, and performs their ceremonies in ritual robes for the other half of the year. Within, and especially outside of, specific areas of Wicca and Pagan, reasons other than tradition may be given to explain a preference for skyclad worship. Starhawk states in Spiral Dance, "The naked body represents truth, the truth that goes deeper than social custom" and "is a sign that a Witch's loyalty is to the truth before any ideology or any comforting illusions.'"
The term "skyclad" is most likely derived from Indian religions, where the term Digambara literally means "sky-clothed". England had close links with India at the time when Wicca first became public in England, so this usage could well have been familiar to English speakers with a knowledge of Far Eastern religions. In particular, Gerald Gardner, who first popularized Wicca in England, was a noted folklorist with an interest in Far Eastern culture who spent much of his adult life in Ceylon and Burma, so it seems very plausible that he could have been familiar with this Hindu term"
Source and More