Hmam bin Yahya bin Dinar همام بن يحيى بن دينار · The Book on Clothing

That the Messenger of Allah (ﷺ) said: "Wearing silk and gold has made unlawful for the males of my Ummah and lawful for its females. There are narrations on this topic from 'Umar, 'Ali, 'Uqbah bin 'Amir, Anas, Umm Hani, Hudhaifah, 'Abdullah bin 'Amr, 'Imran bin Husain, 'Abdullah bin Az-Zubair, Jabir, Abu Raihanah, Ibn 'Umar, Al-Bara', and Wathilah bin Al-Asqa', and this Hadith is Hasan Sahih.

That 'Umar gave a Khutbah at Al-Jabiyah and he said: "The Messenger of Allah (ﷺ) prohibited silk except for two finger's worth of space, or three, or four." This Hadith is Hasan Sahih.