I heard 'Umar bin al-Khattab ؓ say in his khutbah that he heard the Messenger of Allah ﷺ say: ʿ Whoever wears silk in this world will not be clothed with it in the Hereafter.ʿ (Using translation from Aḥmad 123)
سَمِعَ النَّبِيَّ ﷺ يَقُولُ «مَنْ لَبِسَ الْحَرِيرَ فِي الدُّنْيَا فَإِنَّهُ لَا يُكْسَاهُ فِي الْآخِرَةِ»