佛祖統紀 33.57

33.57

喪服　釋氏之論喪服。涅槃諸律並無其制。智者臨終誡曰。世間哭泣喪服皆不應為。今案遠師喪儀云。受業和上同於父母。皆三年服。若依止師隨師喪暫為服。應師五杉集云。師服但用布。稍粗純染黃褐（據此未嘗許用白布）。

Mourning Garments: In the Buddhist discourses on mourning garments, the Nirvāṇa [Sūtra] and the various Vinayas contain no such system. When Master Zhi[yi] was nearing death, he admonished: 'Worldly weeping and mourning garments must not be adopted at all.' Now, examining Master [Hui]yuan's Mourning Rites, it states: 'The upādhyāya from whom one received the profession is treated the same as one's parents: both are mourned for three years. If it is an ācārya one relied upon, one temporarily wears mourning garments following the master's passing.' Master Ying's Wushan ji states: 'Garments for mourning a master should only be made of cloth, somewhat coarse, dyed purely in yellowish-brown (based on this, the use of white cloth was never permitted).'