四分律行事鈔資持記 3.51

3.51

第五中，初引律示法。䩙，胡犬反，鉤也。準下，顯示文意。《業疏》云：逼邊緣四指安鉤，擬反向後八指取紐；以覆左肩，故有遠近也。《章服儀》云：良以用衣右角掩覆左肩；前鉤後紐，收束便易；所以西來聖像，東土靈儀，衣在左肩，無垂肘膝等。（今時垂肘象鼻非法。）

In the fifth [section], first the Vinaya is cited to show the rule. Qian (䩙), pronounced hu-quan (胡犬反), means a hook. "According to... below" reveals the meaning of the text. The Karma Commentary states: "Install the hook four finger-breadths close to the border, intending to turn back eight finger-breadths to the rear to take the loop; because it covers the left shoulder, there is [this difference in] distance." The Demeanour for Robes and Vestments states: "Truly, because one uses the right corner of the robe to wrap and cover the left shoulder, having the hook in front and the loop in back makes fastening easy and convenient. Therefore, the sacred statues that came from the west and the venerable likenesses of the eastern land have the robe upon the left shoulder, without letting it drape down over the elbow or knee." (In present times, letting it drape over the elbow like an elephant's trunk is contrary to the Dharma.)