(Mv.VIII.28.1) [168] Now on that occasion a certain monk, being naked, went to the Blessed One and, on arrival, said to him, “Lord, the Blessed One is one who speaks in many ways in praise of modesty, contentment, austerity, polishing away (defilements), confidence, shedding, and activated persistence. Now, nakedness leads in many ways to modesty, contentment, austerity, polishing away (defilements), confidence, shedding, and activated persistence. It would be good, lord, if the Blessed One would allow nakedness for the monks.”

The Buddha, the Blessed One, rebuked him, “Worthless man, it is unseemly, …

“Worthless man, how can you follow nakedness, a sectarian observance? Worthless man, this neither inspires faith in the faithless …”

Having rebuked him and given a Dhamma talk, he addressed the monks:

“Monks, nakedness, a sectarian observance, should not be followed. Whoever should follow it: a thullaccaya offense.”