GYMNOSOPHIST
gymnosophist
(noun) member of a Hindu sect practicing gymnosophy (especially nudism)
Source: WordNet® 3.1
Etymology
Noun
gymnosophist (plural gymnosophists)
One of a school of ancient Indian ascetic philosophers, reported in antiquity, who wore little clothing; a mystic.
Source: Wiktionary
Gym*nos"o*phist, n. Etym: [Gr. gymno`s naked + gymnosophisle.]
Definition: One of a sect of philosophers, said to have been found in India
by Alexander the Great, who went almost naked, denied themselves the
use of flesh, renounced bodily pleasures, and employed themselves in
the contemplation of nature.
Source: Webster’s Unabridged Dictionary 1913 Edition