I came to the Messenger of Allah (ﷺ) with a company of Muzainah and we swore allegiance to him. The buttons of his shirt were open. I swore allegiance to him and I put my hand inside the collar of his shirt and felt the seal.

'Urwah said: I always saw Mu'awiyah and his son opening their buttons of the collar during winter and summer. They never closed their buttons.
Sunan Abi Dawud Book 34, Hadith 63
← Previous Hadith The Messenger of Allah (ﷺ) forbade that a man should wrap himself completely in a garment with his hands hidden it, or sit in a single garment with his hands round his knees.

Sunan Abi Dawud Book 34, Hadith 62 Next Hadith → We were seated in our house in the noonday heat. Someone said to Abu Bakr: Here is the Messenger of Allah (ﷺ) coming to us shading his head at the hour when he would not generally come. The Messenger of Allah (ﷺ) then came; he asked for permission and he gave him permission and he entered.

Sunan Abi Dawud Book 34, Hadith 64