Sayyiduna Ali (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) forbade me "to wear a ring on these." Asim said: I do not know which two fingers they were. And he (peace and blessings be upon him) "also forbade wearing qassi garments and also forbade sitting on silk saddle-cloths (mayathir)." Qassi was a ribbed cloth which used to come from Egypt and Syria, and by mayathir is meant the cloth which women used to make for their husbands to use as saddle-covers, like red-coloured wraps.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6118