Hadith 4117
Safiyyah, daughter of Abu Ubayd, said: When the Messenger of Allah ﷺ mentioned lower garment, Umm Salamah, wife of the Messenger of Allah ﷺ, asked him: And a woman, Messenger of Allah? He replied: She may hang down a span. Umm Salamah said: Still it (foot) will be uncovered. He said: Then a forearm's length, nor exceeding it.
Hadith 4118
The tradition mentioned above has also been transmitted by Umm Salamah from the Prophet ﷺ through a different chain of narrators. Abu Dawud said: Ibn Ishaq and Ayyub bin Musa transmitted it from Nafi from Safiyyah.
Hadith 4119
Narrated Abdullah ibn Umar: The Messenger of Allah ﷺ gave licence to others of the believers (i. e. the wives of the Prophet) to hang down their lower garment a span. Then they asked him to increase it, and he increased one span for them. They would send (the garment) to us and we would measure it one forearm's length for them.