Sahih Bukhari Volume 2, Book 26, Hadith Number 615.

Narated By ‘Abdullah bin ‘Umar : A man asked, “O Allah’s Apostle! What kind of clothes should a Muhrim wear?” Allah’s Apostle replied, “He should not wear a shirt, a turban, trousers, a headcloak or leather socks except if he can find no slippers, he then may wear leather socks after cutting off what might cover the ankles. And he should not wear clothes which are scented with saffron or Wars (kinds of Perfumes).”