From Sahih Bukhari (Hadith 352):
Narrated Muhammad bin Al-Munkadir:Once Jabir prayed with his Izar tied to his back while his clothes were Lying beside him on a wooden peg. Somebody asked him, "Do you offer your prayer in a single Izar?" He replied, "I did so to show it to a fool like you. Had anyone of us two garments in the lifetime of the Prophet?
Reference: Bukhari 352