a woman should not appear in front of men wearing pants or trousers
a woman should not appear in front of men wearing pants or trousers because they show the shape of the woman’s legs
Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said:
I think that the Muslims should not follow these fashions and kinds of clothes that come to us from here and there.
Many of them are not in accordance with proper Islamic dress which involves covering the woman completely, like the short or very tight or thin clothes.
That includes pants, because they show the size of a woman’s legs, as well as her stomach, waist, breasts, etc.
Wearing it comes under the description given in the saheeh hadeeth:
“there are two types of the people of Hell whom I have not seen:
people with whips like the tails of cattle, with which they strike the people, and women who are clothed yet naked, walking with an enticing gait, with something on their heads that looks like the humps of camels, leaning to one side.
They will never enter Paradise or even smell its fragrance, although its fragrance can be detected from such and such a distance.”
This hadeeth was narrated by Muslim, 2128.
End quote from Majmoo’ Fataawa al-Shaykh Ibn ‘Uthaymeen.
With regard to wearing pants under a jilbaab, there is nothing wrong with that, rather it is more covering and more protective, if the jilbaab is wide and concealing and does not have any splits that show what is underneath it.