From Sahih Bukhari (Hadith 313):
Narrated Um-`Atiya:We were forbidden to mourn for a dead person for more than three days except in the case of a husband for whom mourning was allowed for four months and ten days. (During that time) we were not allowed to put kohl (Antimony eye power) in our eyes or to use perfumes or to put on colored clothes except a dress made of `Asb (a kind of Yemen cloth, very coarse and rough). We were allowed very light perfumes at the time of taking a bath after menses and also we were forbidden to go with the funeral procession
Reference: Bukhari 313