An Shigao
Between 148 and 170 CE, the Parthian monk An Shigao came to China and translated a work which describes the color of monastic robes used in five major Indian Buddhist sects, called "Da Biqiu Sanqian Weiyi" (Ch. 大比丘三千威儀). Another text translated at a later date, the "Śāriputraparipṛcchā", contains a very similar passage corroborating this information, but the colors for the Sarvāstivāda and Dharmaguptaka sects are reversed.