Abu Umar said: I saw with Asma' bint Abi Bakr (may Allah be pleased with her) a shirt fastened with silk buttons. She said: "The Prophet (peace and blessings be upon him) used to wear this in battle."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6073