According to Islamic Sharia, a Mahram can see the whole body of a woman, except of her vagina and buttocks.

This means:

  • A father can see even the naked breast of his daughter,

  • and a son can also see the naked breasts of his mother,

  • and a brother can also see the naked breasts of his sister.

  • and a nephew/uncle can also see the naked breasts of their aunt/niece.

Please read the following fatwa:

https://daruliftaa.com/womens-issue/are-a-womans-breasts-part-of-her-awra-in-front-of-mahram-men/

Question:

Your answer on the female awra in front of her mahram’s seems to suggest she can expose her chest (breasts) to her mahram (father, brother, son etc). Please clarify as this is causing confusion.

Answer:

In the name of Allah, Most Compassionate, Most Merciful,

As you rightly point out, it was stated in an earlier detailed article that the nakedness (awra) of a woman in front of her Mahram men (unmarriageable kin) such as the father, brother, son, paternal uncle (father’s brother), maternal uncle (mother’s brother), father in-law, grandson, husband’s son (from another marriage) and son in-law consists of the area between the navel and knees (including the knees) and the stomach and back. It was also stated that as a consequence it will be permissible for a woman to expose her head, hair, face, neck, chest, shoulders, hands, forearms, and legs from below the knees in front of Mahram men and impermissible to expose the stomach, back or any area which is between the navel and knees. This ruling was based on the verse of Surah al-Nur (24-31) as explained by the Hanafi jurists (fuqaha) in al-Fatawa al-Hindiyya, 5/328, al-Hidaya, 4/461 and elsewhere.

It is also evident from this hadith of 'Aisha.

Sahih Bukhari, 251:

Narrated Abu Salama: `Aisha's brother and I went to `Aisha and he asked her about the bath of the Prophet. She brought a pot containing about a Sa` of water and took a bath and poured it over her head and at that time there was a screen between her and us.

Imam Ibn Hajar al-Asqallani is considered as an ultimate Hadith Master by Muslims. He wrote the commentary of Sahih Bukhari. And under the commentary of this hadith, he wrote (link):

 قال القاضي عياض : ظاهره أنهما رأيا عملها في رأسها وأعالي جسدها مما يحل نظره للمحرم ; لأنها خالة أبي سلمة من الرضاع أرضعته أختها أم كلثوم وإنما سترت أسافل بدنها مما لا يحل للمحرم النظر إليه 

Qadi Ayad said: It is apparent that they could see her actions from her head and the top half of her body, because they were allowed to do as she was a milk-aunt to Abu Salamah and his brother from her sister Umm Kulthum. As for the lower part of her body, this was covered.

The Prophet’s wife exposed the entire upper half of her body, hair, breasts, and all. The Muslim Scholars says that this is permissible because the sister of ‘A’isha had nursed Abu Salamah and his brother.

The 'Awrah of a slave woman is also from navel till knee

Moreover, the 'Awrah of a slave women in Islam was also from navel till knee. And thus all people were allowed to see their naked breasts. There were thousands of slave women present in public and in front of Muhammad with naked breasts.

You can find all the references about naked breasts of slave women in this article:

Part 2: Allah/Muhammad forced the poor slave-women to move with naked breasts in the public ⭐ ᵐᵘˢᵗ ʳᵉᵃᵈ ⭐