Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "Silk and gold are forbidden to the males of my Ummah and permissible for their women."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7558