Musnad Ahmad 31:129

Yahya ibn Ishaq narrated to us, Ibn Lahi'ah narrated to us, from Habban ibn Wasi', from his father, he said: I heard Abu Sa'id al-Khudri saying: The Messenger of Allah, peace and blessings of Allah be upon him, said: "If one of you prays in a garment, let him place its two ends over his shoulders."