Musannaf Ibn Abi Shayba 16:601

Abu Bakr narrated to us, he said: Yahya bin Sa'id narrated to us, from Muhammad bin Abi Yahya, from Ikrimah, who said: I saw Ibn Abbas wearing an izar (waist-wrapper), and he let his izar hang down from his front until its hem fell upon the tops of his feet, and he raised it from his back.