´It was narrated that Umm Salamah said:` “The Messenger of Allah (ﷺ) was asked about how long a woman’s hem should hang down. He said: ‘A hand span.’ I said: ‘But then (her legs and feet) will be uncovered.’ He said: ‘Then a forearm’s length, but no more than that.’”
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefit:
By "one span" or "one hand" is meant the extent below the ankles.
Hafiz Ibn Hajar rahimahullah writes regarding this:
In summary, there are two states for men:
The recommended (mustahabb) state is that the lower garment (izaar) be raised up to the middle of the shin.
And the permissible (ja'iz) state is that it be up to the ankles (above them).
Similarly, there are two states for women as well.
The recommended (mustahabb) state is that it be one span more than the permissible state for men.
And the permissible (ja'iz) state is one hand, that is, two spans more than the permissible state for men. (Fath al-Bari: 10/320)
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 3580
Shaykh Dr. Abdur Rahman Freywai
Explanation: 1:
That is, permission was given to let it hang down to the length of one handspan.
Note:
(Based on the support from the aforementioned hadith of Abu Dawud and Ibn Majah, this hadith is also considered sahih li ghayrihi (authentic due to corroborating evidence); otherwise, in its chain of narration, ‘Ali ibn Zayd ibn Jud’an is a weak narrator.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 1732
Shaykh Umar Farooq Saeedi
Benefits and Issues:
It is obligatory for a woman to keep her ankles and feet covered (in hijab) when outside the home.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 4117