It is not permissible for a woman to expose herself before women or her mahrams (relatives one may not marry) except for what is customary to expose

Question:
The questioner, Maim al-Shahrani, sent a message saying: On one occasion, I saw several girls wearing very tight clothes that clung to the parts of their bodies. When I tried to advise them about it, they argued that there is no harm in it if it is among women. Is what we said correct, or are they in error? May Allah reward you with good.

Answer:
It is not permissible, and it is incorrect, for a woman to expose any part of her 'awrah (the part of the body that must be covered) before women. It is not permissible for her to expose herself before women or before her mahrams (relatives one may not marry) except for what is customary to expose and what must be exposed, such as the head, face, hands, and feet. These are the things that are exposed before women and mahrams. As for anything else, it is not permissible to expose it because of the fitnah (trial, discord or temptation) involved in it, and because of the bad example it sets. For whoever sees her in this state will imitate her, and perhaps this exposure will be used outside, before men who are not mahrams. This leads to laxity and a bad example. Yes.