It was narrated from Ibn Buraidah, from his father, that an-Najashi sent a pair of pure black Khuff as a gift to the Prophet ﷺ of, which he wore.  

أَنَّ النَّجَاشِيَّ أَهْدَى لِرَسُولِ اللَّهِ ﷺ خُفَّيْنِ سَاذَجَيْنِ أَسْوَدَيْنِ فَلَبِسَهُمَا