It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) delivered a sermon to the people while he had a black turban on his blessed head.
Hadith Referenceشمائل ترمذي / باب ما جاء فى عمامة رسول الله صلى الله عليه وسلم / 117