Musnad Ahmad 1153:113

Sufyan narrated to us, from Hisham, from his father, from Aisha: "The Messenger of Allah, may Allah bless him and grant him peace, was shrouded in three white Sahuli garments." And Abu Bakr said to me: "In what was the Messenger of Allah, may Allah bless him and grant him peace, shrouded?" I said: "In three garments." He said: "Shroud me in these two garments of mine, and buy a third garment."