四分律行事鈔資持記 3.59

3.59

從衣中。牒下衣名者，以名是通，隨用分故。牒上衣條數者，由體是定，如實稱故。（有云五條衣受者，非。）注云乃至七條，應云此安陀會七條衣受，兩長一短截割衣持。

Under "Secondary Robes": reciting the name of the lower robe is because the name is general and distinguished according to its use. Reciting the number of strips of the upper robe is because its substance is fixed and must be named in accordance with reality. (Those who say it is received as a five-strip robe are mistaken.) The note says "up to seven strips"; it should say: "I receive this antarvāsa as a seven-strip robe, maintaining it as a cut-and-pieced robe of two long and one short [strips]."