Does taking off the khuffs and wearing them again while in state of ablution invalidate ablution?
The ablution of a person who wears his khuffs after washing his feet in ablution is not invalidated by taking off and wearing them back as long as he maintains his state of ablution. In the event that he completed ablution by wiping over khuffs, not his state of ablution but only wiping over the khuffs will be nullified when he takes off the khuffs afterwards. In that case, his ablution will be valid again if he wears the khuffs back after washing his feet again. (Marghinani, al-Hidayah, I, 198,199; Mawsili, al-Ikhtiyar, I, 90, 95).
Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS