Language:
كتاب الصلاة
8  
Prayers (Salat)
(16)
Chapter: Whoever offered Salat (prayer)in a silk Farruj (an outer garment opened at the back) and then took it off.
(16)
باب مَنْ صَلَّى فِي فَرُّوجِ حَرِيرٍ ثُمَّ نَزَعَهُ
Sahih al-Bukhari 375

Narrated `Uqba bin 'Amir:

The Prophet (ﷺ) was given a silken Farruj [??] as a present. He wore it while praying. When he had finished his prayer, he took it off violently as if with a strong aversion to it and said, "It is not the dress of Allah-fearing pious people."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ يَزِيدَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ أُهْدِيَ إِلَى النَّبِيِّ صلى الله عليه وسلم فَرُّوجُ حَرِيرٍ، فَلَبِسَهُ فَصَلَّى فِيهِ، ثُمَّ انْصَرَفَ فَنَزَعَهُ نَزْعًا شَدِيدًا كَالْكَارِهِ لَهُ وَقَالَ ‏ "‏ لاَ يَنْبَغِي هَذَا لِلْمُتَّقِينَ ‏"‏‏.‏
Reference : Sahih al-Bukhari 375
In-book reference : Book 8, Hadith 27
USC-MSA web (English) reference : Vol. 1, Book 8, Hadith 372
  (deprecated numbering scheme)