大比丘三千威儀 1.94

1.94

行到時著法衣有五事：一者道中見三師，當出右肩；二者覆兩肩，當從喉下出右手；三者覆兩肩，得從下出右手；四者行泥中，得持一手斂衣；五者還入戶恐污衣，得兩手斂衣。

When wearing the Dharma robe while walking, there are five matters: first, when meeting the three masters on the road, bare the right shoulder; second, when covering both shoulders, draw out the right hand from below the throat; third, when covering both shoulders, you may draw out the right hand from below; fourth, when walking in mud, you may gather the robe with one hand; fifth, when returning and entering through a door, fearing that the robe might be soiled, you may gather the robe with both hands.