It was narrated from Jabir bin Abdulla that the Prophet entered on the day of the Conquest of Makkah wearing a back Imamah, without being in Ihram. (Using translation from Nasāʾī 2869)
أَنَّ رَسُولَ اللهِ ﷺ دَخَلَ يَوْمَ فَتْحِ مَكَّةَ وَعَلَيْهِ عِمَامَةٌ سَوْدَاءُ بِغَيْرِ إِحْرَامٍ