四分律比丘含注戒本 2.809

2.809

若比丘，與如來等量作衣，或過量作衣，波逸提。是中如來衣量者，長佛九磔手，廣六磔手，是謂如來衣量。

If a bhikṣu makes a robe equal in measure to the Tathāgata's or makes a robe exceeding the measure, it is a prāyaścittika. Herein the measure of the Tathāgata's robe is: nine Sugata spans in length, and six spans in width. This is called the measure of the Tathāgata's robe.