Abu Rimtha Taymi R.A. says:
"I went with my son to Rasulullah (Sallallahu alaihe wasallam). (Probably he had not see Rasulullah (Sallallahu alaihe wasallam) before). When I saw him I said to myself immediately, 'This is the true Messenger of Allah'. At that time Rasulullah (Sallallahu alaihe wasallam) was wearing two pieces of green clothing. (His lungi-sarong, waist-wrap and shawl were both green). On a few hairs there were signs of old age, but those hair were red".
English reference: Book 5, Hadith 42
Arabic reference: Book 5, Hadith 43