瑜伽師地論略纂 8.42

8.42

論曰「不應開紐」者，謂不應不繫紐。法師云：衣下有紐，不應開，應繫之。亦應不應。　「不軒不磲」，衣不𥖜烈。

The treatise says: "One should not untie the fastenings"; this means one should not leave the fastenings untied. The Dharma Master says: below the robe there are fastenings; one should not undo them, but should tie them. It applies to both what should and should not be done. "Not puffed up and not flared out": the robe is not billowing or split open.