And the Noble Prophet (peace and blessings be upon him) forbade two types of clothing: one is that a person sits wrapped in a single garment with nothing covering his private parts at all, and the second is that a person wraps himself in his lower garment while praying. And he forbade the transactions of mulamasah, munabadhah, muhaqalah, and muzabanah.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9435