Awra outside prayer {in front of Muslim women }

The Awra of a woman in front of fellow Muslim women is the same to that which is a man’s Awra in front of other men, i.e. from the navel up to and including the knees.
It is stated in al-Hidaya:
“A woman may see of another (Muslim, m) woman that which is permitted for a man to see of another man, due to them being from the same sex, and the non-existence of desire (shahwa) between them normally…..Similarly, due to the need and requirement of them exposing amongst themselves”. (See: al-Marghinani, al-Hidaya, 4/461).
Therefore, a woman must cover from the navel up to and including her knees in front of other Muslim women.