A person asked Allah's Messenger (ﷺ) about the offering of the prayer in a single garment. Allah's Messenger (ﷺ) replied, "Has every one of you got two garments?"
Sahih al-Bukhari Book 8, Hadith 10
← Previous Hadith (the freed slave of Um Hani) Um Hani, the daughter of Abi Talib said, "I went to Allah's Messenger (ﷺ) in the year of the conquest of Mecca and found him taking a bath and his daughter Fatima was screening him. I greeted him. He asked, 'Who is she?' I replied, 'I am Um Hani bint Abi Talib.' He said, 'Welcome! O Um Hani.' When he finished his bath he stood up and prayed eight rak`at while wearing a single garment wrapped round his body and when he finished I said, 'O Allah's Messenger (ﷺ) ! My brother has told me that he will kill a person whom I gave shelter and that person is so and so the son of Hubaira.' The Prophet (ﷺ) said, 'We shelter the person whom you have sheltered.' " Um Hani added, "And that was before noon (Duha).

Sahih al-Bukhari Book 8, Hadith 9 Next Hadith → The Prophet (ﷺ) said, "None of you should offer prayer in a single garment that does not cover the shoulders."

Sahih al-Bukhari Book 8, Hadith 11