Sahih Bukhari Volume 7, Book 72, Hadith Number 693.

Narrated By ‘Uqba bin ‘Amir : A silken Farruj was presented to Allah’s Apostle and he put it on and offered the prayer in it. When he finished the prayer, he took it off violently as if he disliked it and said, “This (garment) does not befit those who fear Allah!”