Sahih Al Bukhari (365)

عن أبي هريرة قال: قام رجل إلى النبي صلى الله عليه وسلم، فسأله عن الصلاة في الثوب الواحد، فقال: (أوكلكم يجد ثوبين). ثم سأل رجل عمر، فقال: إذا وسع الله فأوسعوا، جمع رجل عليه ثيابه، صلى رجل في إزار ورداء، في إزار وقميص، قال: وأحسبه قال: في تبان ورداء.

Abu Hurayrah (may Allah be pleased with him) narrated: "A man stood up and asked the Prophet (peace be upon him) about praying in a single garment. The Prophet (peace be upon him) said: Has every one of you two garments? A man put a similar question to `Umar on which he replied: When Allah makes you wealthier, then you should clothe yourself properly during Salah. Otherwise one can pray with an Izar and a Rida’ (a sheet covering the upper part of the body.) Izar and a shirt, Izar and a Qaba', trousers and a Rida’, trousers and a shirt or trousers and a Qaba’, Tubban and a Qaba’ or Tubban and a shirt. (The narrator added: “I think that he also said a Tubban and a Rida.")"