Musnad Abu Ya'la al-Mawsili 3:67

Ubayd Allah narrated to us, Uthman ibn Umar narrated to us, a sheikh from the people of Kufa, who is called Abu al-Muhayya al-Taymi, narrated to us, he said: Abu Matar narrated to me that Ali came to the clothes merchants and said to a man: "Sell me a shirt for three dirhams." He said: So he gave him a garment, and he wore it, [reaching] from his ankle to his wrist. When he wore it, he said: "Praise be to Allah who has clothed me with adornment with which I cover my nakedness and beautify myself among the people." Then he said: "The Prophet, may Allah bless him and grant him peace, when he wore a new garment, used to say like this."