It should be noted that it is not permissible for men to wear sewn clothes while being in the state of ihram. It is recommended that such clothes be white. As for a woman, she can wear her ordinary clothes without any extravagance or adornment. It is not necessary for the clothes to be white. If a man wears other colours —so long as they are not sewn— then there is nothing wrong with him and his Hajj is valid. Also, the colour is not a condition in the case of women’s clothes. Women are to wear their ordinary clothes but they are not to cover their faces nor wear gloves.
Sheikh `Abdul-Halim Mahmoud, former Grand Imam of Al-Azhar, states that: Hajj is a season for utter submission to Allah and showing repentance to Him. It is the season in which the person severs all ties with his past sins and previous transgression and bridges the gap that separates him from disobedience. One of the symbols that mark such a change is the clothes of ihram, which, with its white colour, reflect the inner whiteness and purity of the heart of such person. Though the colour is not a condition in such clothes, it is still preferred that they are white. If a person has an illness that makes him unable to put on the clothes of ihram, here we find the mercy of Allah manifested in exempting such a person from wearing the clothes. Still, he is required to offer a compensation for failing to wear the clothes of ihram. The compensation is either slaughtering a sheep, feeding six people, or offering three days of fast. A person can do any one of these according to what he chooses. As for a woman, she is to wear her ordinary clothes that cover all her body except her face and hands.
Allah Almighty knows best.