Musannaf Ibn Abi Shayba 9:1808

17711. Abu al-Ahwas narrated to us, from Abu Ishaq, from Harithah ibn Mudarrib, who said: Umar said: "Seek help against women through nakedness (i.e., by restricting their clothing). For indeed, when one of them has many garments and her adornment is beautiful, she becomes fond of going out."