Fighting for the Cause of Allah (Jihaad)
Bukhari :: Book 4 :: Volume 52 :: Hadith 172
(Wearing of silk) was allowed to them (i.e. 'AbdurRahman and Az-Zubair) because of the itching they suffered from.
Source materials are from the University of Southern California MSA site|
Hadith eBooks converted from Imaan Star