It was narrated that Abu `Uthman said:
We were with `Utbah bin Farqad and `Umar رضي الله عنه wrote to him about things he narrated from the Prophet (ﷺ). Among the things he wrote was that the Messenger of Allah (ﷺ) said: `No one wears silk in this world except one who will not wear it in the Hereafter, except this much,` and he gestured with his two fingers, the forefinger and the middle finger. Abu `Uthman said: I thought this referred to the edging of the tayalisah (a shawl-like garment) when we first saw the tayalisah.