The Prophet (ﷺ) came to visit her when she was veiled, and said: use one fold and not two.

Abu Dawud said: "Use one fold and not two" means: "Do not fold it like the turban of a man. Do not double it up manifolds."
Sunan Abi Dawud Book 34, Hadith 96
← Previous Hadith On his father's authority, said that his grandfather reported the Prophet (ﷺ) said: When one of you marries his female servant to his slave or to his employee, he should not look at her private part below the navel and above the knees.

Abu Dawud said: The correct name is Sawwad b. Dawud al-Muzani al-Sairafi (and not Dawud b. Sawwad as mentioned in the chain). The narrator waki' misunderstood it.

Sunan Abi Dawud Book 34, Hadith 95 Next Hadith → The Messenger of Allah (ﷺ) was brought some pieces of fine Egyptian linen and he gave me one and said: Divide it into two; cut one of the pieces into a shirt and give the other to your wife for veil. Then when he turned away, he said: And order your wife to wear a garment below it and not show her figure.

Abu Dawud said: Yahya b. Ayyub transmitted it and said: 'Abbas b. 'Ubaid Allah b. 'Abbas

Sunan Abi Dawud Book 34, Hadith 97