四分律比丘含注戒本 1.444

1.444

憶念者，若執事人若在家，若在市肆，若在作處，應至彼處，一反、二反、三反，語言「我今須衣，與我作」者是也。

As for 'reminding': if the attendant is at home, in the marketplace, or at a workplace, he should go to that place once, twice, or three times, and say, 'I now need a robe; make it for me'—this is it.