(91) باب الْحَرِيرِ فِي الْحَرْبِ
Narrated Anas:
(Wearing of silk) was allowed to them (i.e. `AbdurRahman and Az-Zubair) because of the itching they suffered from.
Reference: Sahih al-Bukhari 2922
In-book reference: Book 56, Hadith 135
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 172