Musannaf Ibn Abi Shayba 16:563

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from Abu Salih, he said: Umar said: "Do not clothe your women in Qibati (fine Egyptian linen), for if it does not show through, it describes (the shape of the body)."