Ruling on wiping over the leather sock after wiping over the cotton sock

Question:
I say, Honorable Shaykh, is it permissible to wipe over the cotton sock, then put on the leather sock over the cotton sock without being in a state of wudu, and then wipe over the leather sock instead of wiping over the cotton sock?

Answer:
No. If one begins by wiping over the cotton sock, then it is obligatory to wipe over it. So when he wants to wipe, he removes the leather sock and wipes over the cotton sock. As for if he put on the leather sock before wiping over the cotton sock, then he wipes over the leather sock. If he begins by wiping over the leather sock, he continues. If he begins by wiping over the cotton sock and then puts on a leather sock over it, then when it is time to wipe, he removes the leather sock and wipes over the cotton sock.