Narrated Abu Huraira (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) said: None of you should pray in a single garment with nothing on his shoulders.

Narrated Abu Huraira (may Allah be pleased with him): I bear witness that I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: Whoever prays in a single garment should separate its two ends (i.e., place the right end on the left shoulder and the left end on the right shoulder).