Muhammad bin Abi Sufyan (may Allah be pleased with him) narrates that he heard Sayyidah Umm Habibah (may Allah be pleased with her), the wife of the Prophet (peace and blessings be upon him), saying: I saw the Prophet (peace and blessings be upon him) praying, and at that time he had a single garment on him.
Ahmad recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2206