Ubaidullah bin 'Umar bin Hafs عبيد الله بن عمر بن حفص بن عاصم · Clothing (Kitab Al-Libas)

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.