Volume 1, Book 5, Number 267:
Narrated Muhammad bin Al-Muntathir:
on the authority of his father that he had asked ‘Aisha (about the Hadith of Ibn ‘Umar). She said, “May Allah be Merciful to Abu ‘Abdur-Rahman. I used to put scent on Allah’s Apostle and he used to go round his wives, and in the morning he assumed the Ihram, and the fragrance of scent was still coming out from his body.”
Scent can be used before putting on the Ihraam. What’s forbidden is to put scent on the clothes of Ihraam or wear the scent when in the state of Ihraam.
Wives may put scent on their husbands. :)