It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when the Prophet (peace and blessings be upon him) married Sayyidah Fatimah (may Allah be pleased with her), he said: "O Ali! Do not go in to your wife until you have given her something." Sayyiduna Ali (may Allah be pleased with him) said: "O Messenger of Allah! I do not have anything." He (peace and blessings be upon him) said: "Give her your Hutamiyyah coat of mail."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11950