How much "provision" is mandated in this āyah?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. The maximum amount is a servant, and the minimum is clothing sufficient for her to pray in. [Reported from Ibn ʿAbbās and Saʿīd ibn al-Musayyib]
2. It is equivalent to half the dowry that would be appropriate for someone of her status. [Ḥammād, Abū Ḥanīfah]
3. It should be according to his wealth or poverty, and this should be determined by the judge's discretion. [Al-Shāfiʿī, Aḥmad]
4. The provision should be clothing sufficient for prayer, such as a gown and a headscarf. [Another narration from Aḥmad]