Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said: A silk shirt was given as a gift to the Prophet (peace and blessings be upon him). He (peace and blessings be upon him) wore it and prayed in it. After finishing the prayer, he (peace and blessings be upon him) disliked it and took it off at once, then said: "This garment is not fitting for the God-fearing."
(b) Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) came out one day and prayed in a silk shirt. After finishing the prayer, he (peace and blessings be upon him) took it off and said: "This garment is not fitting for the God-fearing."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4206