四分律行事鈔資持記 2.729

2.729

十一。（佛在曠野國，六群至養蠶家，索蠶綿作臥具，看暴繭招譏而制。）戒本作臥具。昔人迷名，故直標袈裟以異之。

The eleventh. (The Buddha was in the wilderness kingdom; the six group members went to silkworm breeders to solicit silk floss to make bedding, and were seen sunning cocoons, incurring ridicule, and the rule was formulated accordingly.) The Prātimokṣa has "making bedding." Past scholars were confused by the name, so they directly indicated "kāṣāya" to differentiate it.