Rubberized raingear won't work well with a puffy layer directly underneath. It will work just fine under constant drizzle and steady exertion if you layer fleece and only fleece underneath. Your bodyheat will drive moisture out through longjohn and fleece layers to dewpoint at the inside surface of the raingear where it will condense and be damp for the duration...but your skin is dry underneath. If you have a puffy underneath, moisture will drive out through the puffy to where dew point is reached...likely within the puffy insulation. It will wet out. Fleece is your friend, even though it's not nearly as stylish as kuiu softshell or puffy.
I bought a set of breathable hip waders with neoprene socks, and used a pair of slightly-too-big hiking boots for footwear. That setup took me hiking and dragging raft along miles and miles along Alaska waterways on moose hunts. Never tried chest waders but no reason that wouldn't work also...might be a bit limiting for layering and adjusting for temperature and exertion. I can highly recommend the breathable hip waders approach.
Don't be too impressed by "ALASKA" so far as gear is concerned. The north cascades will test your gear as bad or worse. Alaska can get a little squirrely weather-wise in late august, but november in Idaho is way colder. Mid september moose hunting on the south slope of the brooks saw frosty mornings, where a 15F sleeping bag was fine.
