What is the 'awrah' of women with respect to other women?

On another question asked by a member of this forum, the below is quoted: Under what conditions can a Muslim woman wear a bikini? > The 'awrah of a woman amongst other women is the same as the 'awrah of > men (from her navel to her knees). -- Wikipedia It was my understanding that the **awrah of women** was her body except her face, hands and feet **in front of non-mehram men & women**. **Is there a Hadith to support the statement by Wikipedia in the aforementioned post?**