Sayyidina Uqbahibn Aamir (RA)narrated : I said, 0 Messenger of Allah, my sister had vowed that she would walk up to Bayt Allah (House of Allah) bare footed and without a covering cloak.” The Prophet said, “Allah has nothing to do with the hardship enforced on herself by your sister. Let her ride and cover herself and keep fast for three days.”
[Abu Dawud 3293, Nisai 3824, Ibn e Majah 2134, Ahmed 17292]