It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) entered Makkah on the day of the Conquest of Makkah wearing a black turban, and he entered without ihram.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13372