A person asked Messenger of Allah ﷺ about the offering of the prayer in a single garment. Messenger of Allah ﷺ replied, "Has every one of you got two garments?"  

أَنَّ سَائِلاً سَأَلَ رَسُولَ اللَّهِ ﷺ عَنِ الصَّلاَةِ فِي ثَوْبٍ وَاحِدٍ فَقَالَ رَسُولُ اللَّهِ ﷺ أَوَلِكُلِّكُمْ ثَوْبَانِ  

The Prophet ﷺ said, "None of you should offer prayer in a single garment that does not cover the shoulders."  

قَالَ النَّبِيُّ ﷺ لاَ يُصَلِّي أَحَدُكُمْ فِي الثَّوْبِ الْوَاحِدِ لَيْسَ عَلَى عَاتِقَيْهِ شَىْءٌ  

In the house of Um-Salama I saw Messenger of Allah ﷺ offering prayers, wrapped in a single garment around his body with its ends crossed round his shoulders.  

أَخْبَرَهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُصَلِّي فِي ثَوْبٍ وَاحِدٍ مُشْتَمِلاً بِهِ فِي بَيْتِ أُمِّ سَلَمَةَ وَاضِعًا طَرَفَيْهِ عَلَى عَاتِقَيْهِ  

I saw Jabir bin ʿAbdullah praying in a single garment and he said that he had seen the Prophet ﷺ praying in a single garment.  

رَأَيْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ يُصَلِّي فِي ثَوْبٍ وَاحِدٍ وَقَالَ رَأَيْتُ النَّبِيَّ ﷺ يُصَلِّي فِي ثَوْبٍ