My wedding ring is a Z 8.5.
When you have your finger sized for a ring they use the alphabet.Over Z they give them a number in 1/2 size increments.
When I had mine fitted he brought out the ring size steel and the ring is so big that it could not be effectively sized.
I can get in xl gloves of most makes - granted they are tight but you should be able to pick something up.
He shouldn't be getting his hands wet !!!!
Rob