Is it permissible for a woman to wear men's clothing, such as pajamas or tracksuits, at home or in any other place away from the sight of her maharim?

If the aforementioned clothes are specific to men and not women, it is not permissible for a Muslim woman to wear them, whether inside or outside the house. This is because it involves imitating men, which is forbidden. The Prophet, peace and blessings be upon him, cursed men who imitate women and women who imitate men. However, if the clothes are common and worn by both men and women, there is no harm in wearing them.