From his father, about 'Aishah that: "She would walk in one sandal."

This is more correct. This is how it was reported by Sufyan Ath-Thawri and others, from 'Abdur-Rahman bin Al-Qasim, in Mawquf form, and this is more correct.
Jami` at-Tirmidhi Book 24, Hadith 66