Hadith 503210
Chapter 8: Prayer in Congregation - كتاب صلاة الجماعة
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ قَالَ سُئِلَ أَبُو هُرَيْرَةَ هَلْ يُصَلِّي الرَّجُلُ فِي ثَوْبٍ وَاحِدٍ فَقَالَ نَعَمْ . فَقِيلَ لَهُ هَلْ تَفْعَلُ أَنْتَ ذَلِكَ فَقَالَ نَعَمْ إِنِّي لأُصَلِّي فِي ثَوْبٍ وَاحِدٍ وَإِنَّ ثِيَابِي لَعَلَى الْمِشْجَبِ .
Yahya related to me from Malik from Ibn Shihab that Said ibn al- Musayyab said that Abu Hurayra was asked, "May a man pray in one garment?" He said, "Yes." The man then said to him "Do you do that?" and he replied, "Yes, I pray in one garment while my clothes are on the clothes-rack."
Reference Muwatta Malik 503210
USC-MSA web (English) reference : Book 8, Hadith 32