Praise be to Allaah.
A woman can wear whatever she wants in ihraam so long as it is concealing. She should avoid a “dress of fame and vanity”, or tight clothes which show the shape of her body. She should also avoid perfume and wearing the niqaab (face veil) and gloves, but it is OK for her to wear jewellery and change her clothes if she wishes.
The prevalent belief in many countries, that a woman should wear clothes of a certain colour in ihraam has no basis in sharee’ah.
‘Aa’ishah (may Allaah be pleased with her) said: “The woman in ihraam may wear whatever she wants except for clothes that have been scented with wars or saffron (kinds of perfume).” (Narrated by al-Bukhaari in his Saheeh, as a mu’allaq report. Narrated as a mawsool report by al-Bayhaqi in al-Sunan, 5/47, via Shu’bah ibn Yazeed al-Rashk from Mu’aadhah from ‘Aa’ishah; its narrators are thiqaat (trustworthy).