Anas (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) permitted Zubair and `Abdur-Rahman bin `Auf (May Allah be pleased with them) to wear silk because they were suffering from an itch.[Al-Bukhari and Muslim]. (FR)
App reference (FR): Book 4, Hadith 32 (FR)
Arabic/English book reference (FR): Book 4, Hadith 810 (FR)