Hadith 632
Narrated Salamah ibn al-Akwa: I said: Messenger of Allah, I am a man who goes out hunting; may I pray in a single shirt? He replied: Yes, but fasten it even if it should be with a thorn.
Hadith 633
Abdur-Rahman bin Abu Bakr reported on the authority of his father Jabir bin Abdullah led us in prayer in a single shirt, having no sheet upon him. When he finished the prayer he said: I witnesses the Messenger of Allah ﷺ praying in a shirt.