German surplus grey leather Luftwaffe gloves are my favorite.
After getting a new pair very dirty I cleaned them with Balistol (which is great for cleaning and disinfecting leather), rinsed with water, then rubbed in neatsfoot oil while still damp. I then wore them for awhile to let the still moist leather conform to my hands as the leather dried from body heat.
Everything (tools, knives, handguns, rifles, etc) seems to fit my hand better when wearing these. Also a very durable finish.