四分律行事鈔資持記 3.39

3.39

次科，初明如法。所以長增至四，短唯局一者，疏云：法服敬田，為利諸有；表聖增而凡減，喻長多而短少。若下，簡非法。所以成受著用犯者，疏云：著取儀相，用生物善；長短差違，乖慈梵行；隨步越儀，一一結罪。（今時禪眾多作九條，長短不定；或紗或綾，或絣或碧，自號法衣；體色量相，俱乖正制，何法之有。）

In the next section, it first clarifies what is according to the Dharma. The reason the long increases up to four while the short is restricted to one is stated in the Commentary: 'The Dharma robe is a field of respect to benefit the various realms of existence; it symbolizes the holy increasing while the ordinary decreases, and allegorizes that the long are many while the short are few.' From 'If' onward, it distinguishes what is not according to the Dharma. As for the reason why the formal reception is valid but wearing it incurs an offense, the Commentary states: 'Wearing it adopts its proper decorum and form, functioning to generate goodness in living beings; if the long and short are discordant, it violates compassionate pure conduct; with each step transgressing decorum, an offense is incurred for each and every one.' (Nowadays people in the Chan assemblies mostly make nine strips with long and short irregular, sometimes using gauze or damask, sometimes variegated or green, calling them Dharma robes themselves; their material, color, measure, and form all violate the correct regulation—what Dharma is there in that?)