What is permissible for a woman to reveal of her clothing at celebrations among women

Question:
Honorable Shaykh, may Allah grant you success. A woman says: We see many women at celebrations who have become lax in their clothing, such that more than half of their back, a large part of their chest, their knees, and what is below them are exposed. What is permissible to reveal in such occasions, knowing that there are no men present with us?

Answer:
We ask Allah for well-being. This is a form of nakedness, for she is exposing her back, her chest, her legs, and her upper arms. This is nakedness, and it is not permissible, even if she is among women. This is not permissible. Rather, she reveals the extremities that custom has established for uncovering, such as her face, her palms, her feet, and her head. There is no harm in revealing to women what she reveals to her male mahrams (relatives one may not marry), such as her father, her brother, or her son. For Allah mentioned women along with their mahrams from the men up to His saying "or their women," thus placing women with the mahram men. Just as she does not reveal her back, her chest, her breasts, her legs, or her upper arms to her male mahrams, so she does not reveal them to women. Yes.