Majjhima Nikaya 4:82
SUJATO‘yāvadeva sītassa paṭighātāya, uṇhassa paṭighātāya, ḍaṁsamakasavātātapasarīsapasamphassānaṁ paṭighātāya, yāvadeva hirikopīnappaṭicchādanatthaṁ’.
‘Only for the sake of warding off cold and heat; for warding off the touch of flies, mosquitoes, wind, sun, and reptiles; and for covering up the private parts.’