Wa `alaykum as-salam wa rahamatullah wa barakatuh
The area to be covered by a woman when being attended by another woman is what is between the navel and the knee, whether the woman is her mother or sister or is not her mahram. This is the view of the majority of Muslim scholars.
It is not permissible for a woman to look at the area between the navel and the knee of another woman, except in cases of necessity such as medical treatment. It does not necessarily mean that a woman is supposed to show the whole of her body except this area. It rather means that if a part of her body is exposed, she will not be held responsible before Allah.
In case a Muslim feels a doubt against another woman’s way of looking at her or she is afraid that such a woman may describe her body for a male, she must cover her body in her presence. Such is the case when a Muslim woman is attended by a non-Muslim female.
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