He did not allow the wearing of silk except (something) the width of four fingers.
Sunan an-Nasa'i Book 48, Hadith 274
← Previous Hadith "We were with 'Utbah bin Farqad when the letter of 'Umar came, saying that the Messenger of Allah said: 'No one wears silk except one who has no share of it in the Hereafter, except this much.'" And Abu 'Uthman gestured with the two fingers that are next to the thumb. And I saw the two of them pointing to the borders of the Tayalisah, so that I could see the Tayalisah.

Sunan an-Nasa'i Book 48, Hadith 273 Next Hadith → "I saw the Prophet wearing a red Hullah, with his hair combed, and I have never seen anyone before or since, who was more handsome than he."

Sunan an-Nasa'i Book 48, Hadith 275