Narrated Anas (RA):

The Prophet (ﷺ) gave permission to 'Abdur-Rahman bin 'Auf and az-Zubair to wear silk during the journey because of an itching which they suffered from. [Agreed upon].

وَعَنْ أَنَسٍ ‏- رضى الله عنه ‏- { أَنَّ اَلنَّبِيَّ ‏- صلى الله عليه وسلم ‏-رَخَّصَ لِعَبْدِ اَلرَّحْمَنِ بْنِ عَوْفٍ, وَالزُّبَيْرِ فِي قَمِيصِ اَلْحَرِيرِ, فِي سَفَرٍ, مِنْ حَكَّةٍ كَانَتْ بِهِمَا } مُتَّفَقٌ عَلَيْهِ [1]‏ .‏