Musannaf Ibn Abi Shayba 16:746

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, he said: Ubaydullah ibn Umar narrated to us, from Nafi’, who said: Ibn Umar used to wear a turban and let its end hang between his shoulders. Ubaydullah said: Our elders informed us that they saw the companions of the Prophet, may Allah bless him and grant him peace, wearing turbans and letting their ends hang between their shoulders.