Zeinab  Al-`Alawani, Instructor of Fiqh and Islamic Studies,Graduate School of Islamic and Social Sciences, states the following: “Islam does not specify a certain style for women’s dress. It allows people to determine the style as long as it meets the criteria and dress code requirements such as being opaque and loose, etc. But for the colour and style, it is left for people, so people in different countries may have different styles but they must conform to Islamic principles. For example, women living in Pakistan may have different clothes than people living in other geographical locations, but the dress itself must meet certain standards in order to be called Islamic.
With regard to wearing jeans and pants, there are not forbidden in principle, as long as they are loose and covering, and the woman is wearing a long topping that covers her body. It should be noted that when Muslim cities around the world were opened to Islam, they kept their own cultural clothes and styles, so the issue is not the style but the standards and features.”