Ibn 'Abbaas (R.A) says that Rasulullah (S.A.W) used to say:
"Choose white clothing, as it is the best clothing. White clothing should be worn whilst living, and the dead should be buried in white. (ES)
English reference (ES): Book 8, Hadith 65 (ES)
Arabic reference (ES): Book 8, Hadith 67 (ES)