The Prophet ﷺ addressed the people while wearing a black turban.
حدثنا وكيع حدثنا مساور الوراق
أن النبي ﷺ خطب الناس وعليه عمامة سوداء
Its isnad is sahih. Musawir the copyist, no one traced his lineage, was deemed trustworthy by Ibn Main and Ibn Hibban. The hadith has already appeared at 15095.