Ja'far bin 'Amr bin Umayya جعفر بن عمرو بن أمية · The Book of Adornment

She mentioned women's hems to the Messenger of Allah said: "Let it down a hand span." Umm Salamah said: "But that will uncover (her feet)." He said: "Let it down a forearm's length, but no more than that."