The only metal detectorists I've ever seen are in videos and lots of them wear gloves (depending on where they're digging). Most of the MD websites recommend it as well.
Although that's not the reason I've been wearing them. Where we've been digging (basically my yard) is chock full of pieces of sharp metal, nails and the occasional piece of broken glass. It's also nice to be able to remove my gloves and have clean hands to use the phone/camera, clean my glasses, etc.
I'm guessing regular old rubberized gardening gloves would work well as long as they hold up.