How can a woman's prayer be valid when wearing trousers, given the condition of covering the 'awrah during prayer, while her wearing trousers in front of Muslim women and mahrams is considered forbidden because it does not cover the 'awrah?

A woman's prayer in trousers that cover the 'awrah is valid, though disliked. As for a woman wearing trousers alone in front of other women or mahrams, it is not permissible if they describe the body and show its allurements. However, if they are loose, cover the body, and do not reveal the size of the limbs, then it is permissible, provided there is no imitation of men or disbelieving women.