It wasnarrated from Anas bin Malik that the Messenger of Allah (ﷺ)granted a concession to Zubair bin 'Awwam and 'Abdur-Rahman bin'Auf,allowing them to wear silk shirts, because of a rash theyweresuffering from. (RU)
English reference (RU): Vol. 4, Book 32, Hadith 3592 (RU)
Arabic reference (RU): Book 32, Hadith 3723 (RU)