The Messenger of Allah ﷺ gave license to 'Abd al-Rahman b. 'Awf and al-Zubair b. al-'Awwam to wear silk shirts during a journey because of an itch which they had. (Using translation from Abū Dāʾūd 4056)
أَنَّ النَّبِيَّ ﷺ رَخَّصَ لِعَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ فِي قَمِيصٍ مِنْ حَرِيرٍ فِي سَفَرٍ مِنْ حِكَّةٍ كَانَ يَجِدُهَا بِجِلْدِهِ وَلِلزُّبَيْرِ بْنِ الْعَوَّامِ