I have to agree with this 2 glove method. I haven’t used it for fishing yet, but I had to do some work where my hands were immersed in pond water for an hour or so. I used a standard light weight winter glove, say the type you get at any sporting goods store, as the base layer and a pair of thick rubber gloves on top. The rubber gloves were long, up to the elbow, like a mad scientist since my hands were under water.
Worked like a charm. It was easy to slide the outer glove off/on when needed without the under layer getting wet or dirty. Any my hands stayed warm and bone dry.