Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Anas (Radi-Allahu ‘anhu):
The Prophet (Sallallahu ‘Alaihi Wa Sallam) allowed ‘Abdur-Rahman bin ‘Auf and Az-Zubair to wear silken shirts because they had a skin disease causing itching.
Bukhari Vol. 4 : No. 268