Qurra bin Iyas reported,

I came to the Messenger of Allah ﷺ with a group from Mazina, and we pledged allegiance to him while the buttons of his shirt were undone. So I pledged allegiance to him, then I slipped my hand inside the opening of his shirt and touched the Seal of Prophethood.Urwa said, "I never saw Muawiya bin Qurra bin Mura, nor his son, except with their shirt buttons undone, whether in winter or in heat. They never fastened their buttons at all."

Azami 765

Sahih

عن قرة بن إياس، قال

أتيت رسول الله ﷺ في رهط من مزينة، فبايعناه، وإن قميصه لمطلق الأزرار. قال: فبايعته ثم أدخلت يدي في جيب قميصه فمسست الخاتم. قال عروة: فما رأيت معاوية بن قرة بن مرة ولا ابنه قط إلا مطلقي أزرار هما قط في شتاء ولا حر، ولا يزرران أزرار هما أبدا.

الأعظمي 765صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Faith
Chapter
Faith in the Prophet ﷺ
Section
Seal of prophethood and its description
Numbering
Jami al-Kamil 765 (2nd edition)
Azami 765