Musannaf Ibn Abi Shayba 16:989

Abu Bakr narrated to us, he said: Kathir ibn Hisham narrated to us, he said: Ja'far ibn Burqan narrated to us, from al-Zuhri, from Salim, from his father, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade two types of wearing [garments]: The *samma'*, which is for one to wrap himself in a single garment, raising its side over his shoulder, while he has no other garment on him. And for a man to sit in the *ihtiba'* position (holding his legs against his abdomen) in a single garment, with nothing between his private parts and the sky—meaning a covering.