It is narrated from Imran bin Husayn (may Allah be pleased with him) that he (peace and blessings be upon him) said: "I do not ride on a red silk saddle cushion, nor do I wear qassi cloth, nor yellow-dyed cloth, nor do I wear a garment fastened with silk buttons."
Note: The red silk saddle cushion means the saddle of the non-Arabs on which they ride. That is, a shirt whose cuffs are of silk. The silk that is permitted, he (peace and blessings be upon him) has explained. As for Asma' bint Abi Bakr (may Allah be pleased with her) bringing out the cloak, it is possible that he (peace and blessings be upon him) used it on occasions of battle.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6089