It wasnarrated from 'Umar that he used to forbid silk and brocade,exceptfor what was like this:
Then he gestured with his finger, thenasecond, and a third, and a fourth (i.e., the width of four fingers),and he said: "The Messenger of Allah (ﷺ) used to forbid it." (ID)
English reference (ID): Vol. 4, Book 32, Hadith 3593 (ID)
Arabic reference (ID): Book 32, Hadith 3724 (ID)