That 'Abdur Rahman bin 'Awf and Az-Zubair bin Al-'Awwam complained of lice to the Prophet ﷺ during a battle that they participated in. So he permitted them to wear silk shirts. He (Anas) said: "I saw them wearing them."  

أَنَّ عَبْدَ الرَّحْمَنِ بْنَ عَوْفٍ وَالزُّبَيْرَ بْنَ الْعَوَّامِ شَكَيَا الْقَمْلَ إِلَى النَّبِيِّ ﷺ فِي غَزَاةٍ لَهُمَا فَرَخَّصَ لَهُمَا فِي قُمُصِ الْحَرِيرِ قَالَ وَرَأَيْتُهُ عَلَيْهِمَا