Musnad Ahmad 1153:456

'Abd al-Samad narrated to us, he said: My father narrated to me, Habib al-Mu'allim narrated to us, from Yazid Abu al-Muhazzim, from Abu Hurayrah, from 'Aishah, from the Messenger of Allah (may Allah bless him and grant him peace) regarding the hems of women's garments, he said: "A span." She said: I said: "Then their shins will be exposed." He said: "Then a cubit."