Nudity or nakedness (naggaiya) is the state of being without clothes. Throughout history people have gone naked or nearly naked. Hunter-gatherer peoples in tropical regions have often been naked for practical reasons, it has been practiced as a protest, as a punishment and even as something that promotes good health. In ancient India nudity was mainly practiced for religious reasons. The monks of the Jain and the Ājīvakas sects went naked and the Ekasāṭaka ascetics only wore small cloth over their genitals. Nakedness together with tearing the hair out, never cutting the hair and nails, allowing the hair become matted and never washing, were all believed to show complete detachment from the world. The supposed spiritual value of nudity was summed up by the monk who said ‘nudity is useful for desiring little, for contentment, for expunging evil, for scrupulousness, for carefulness, for lessening obstructions and for arousing energy’(Vin.I,305). Twice a month the lay disciples of the Ājīvaka sect would go naked and sleep on the ground in imitation of their clergy, the idea being: ‘I have nothing anywhere and therefore for me there is no attachment to anything’ (A.I,206). As these lay people really gave up nothing and resumed their ordinary lives the next day, the Buddha considered that their ‘renunciation’ was nothing more than a bluff.
The Buddha made it a rule that monks should never go naked, even within their private quarters (Vin.II,121). He said: ‘Nakedness is unbecoming, unsuitable, improper, unworthy of an ascetic, not allowable and not to be done' (Vin.I,305). He objected to it on two grounds. The first was because like all austerities or outward changes nudity does not lead to significant inner change. He said: ‘Not nakedness nor matted hair, not mud nor fasting, not lying on the ground, being unwashed or squatting will purify one who has not passed beyond doubt’ (Dhp.141). He also objected to nudity because it contravened the norms of polite society for no good reason. Lady Visākha once saw some nuns bathing naked and commented; ‘nakedness in women is ugly, abhorrent and objectionable’ (Vin.I,293) which seems to have been the general opinion. The Buddha wanted his monks and nuns to abide by the normal standards of decorum and good manners, the better to be able to communicate the Dhamma to others. The Buddha was also anxious that his monks and nuns should be distinct from those of other sects, outwardly as much as inwardly. Because many of these other ascetics were either completely or partly naked or wore whatever they liked, the Buddha stipulated that his ordained disciples should were a distinct and easily identifiable robe.
Today several sects of Hindu ascetics still practice nudity, the most well-known being the Nagababas.