One of the main problems I find while riding in cold, torrential wet weather is that… whatever gloves I wear, I always end up with freezing cold fingers. Once cold, they never seem warm up and on some occasions this has hampered my ability to flick the gear levers.
I’ve tried this and it works…
Put a spare pair of gloves in a sandwich bag, seal it and then pop it into one of your pockets. You can then swap gloves mid-ride, pull on your nice dry pair and you’ll be the envy of your riding buddies!
You could also try this with socks, a bit more fiddly but worth it if your feet are cold and wet.