"The Messenger of Allah [SAW] forbade Ishtimal As-Samma' and wrapping oneself in a single garment (that did not cover the private parts)."  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ اشْتِمَالِ الصَّمَّاءِ وَأَنْ يَحْتَبِيَ فِي ثَوْبٍ وَاحِدٍ