A Muslim woman should not appear in front of men wearing pants or trousers because they show the shape of the woman’s legs and wearing pants is an imitation of men.

There are many Quranic verses and Prophetic hadiths about the importance of hijab in Islam for Muslim women. For more, please see the detailed answer.

Women observing hijab in front of non-mahram men and covering their faces is obligatory as is indicated by the Quran and the Sunnah and by rational examination and analogy.