摩訶止觀 4.90

4.90

衣者，遮醜陋、遮寒熱、遮蚊虻、飾身體。衣有三種：雪山大士，絕形深㵎，不涉人間。結草為席，被鹿皮衣，無受持、說淨等事。堪忍力成，不須溫厚；不遊人間，無煩支助。此上人也。十二頭陀，但畜三衣，不多不少。出聚入山，被服齊整，故立三衣。此中士也。多寒國土，聽百一助身。要當說淨，趣足供事，無得多求。多求辛苦，守護又苦；妨亂自行，復擾檀越。少有所得，即便知足，下士也。

As for clothing, it conceals ugliness, fends off cold and heat, repels mosquitoes and flies, and adorns the body. There are three kinds of clothing: the great beings of the Snow Mountains, who sever bodily ties in deep ravines and do not enter into human society. They weave grass into mats and wear deer-skin clothing, without such practices as formally receiving [robes] or purity-conferring rituals. Having perfected the power of patience, they do not require thick warmth; not roaming among humans, they do not trouble others for assistance. These are the superior persons. The twelve dhūtas maintain only three robes, neither more nor less. Leaving the village and entering the mountains, their dress is neat and tidy; thus the three robes are established. These are the intermediate persons. In lands of severe cold, up to one hundred and one extra robes are permitted to assist the body. One must perform the purity-conferring ritual and take just enough to serve the need, without seeking much. Seeking much brings toil, and guarding [them] brings further suffering; it impedes and disturbs one's own practice and furthermore troubles the dānapatis. Being content with finding a little—these are the inferior persons.