Is it permissible for a married woman to appear before her brother-in-law in trousers, a blouse, and with her hair uncovered?

The husband's father is a mahram to the woman. Therefore, it is permissible for him to look at her extremities. It is also permissible for her to appear before him in trousers, provided they cover the awrah, are wide and loose, not revealing, and do not involve imitating men.