I usually use those long cotton driving gloves to cover my forearm, and then my regular gardening gloves for my hands. I find it at some Daiso Japanese stores here in the Bay area. It just costs about $1.50 a pair here. It is cotton so allows the skin to breathe at least.
I see they have an online store :
http://www.daisojapan.com/p-27...
But usually the ones I get have printed design and just covers my forearm not my hands.