Let me start by saying I’m primarily a warm water species fisherman (bass, bluegill, crappie, etc.). I do fish for trout when the opportunity presents itself but 80% of my fishing is in warm water in warm months.
However, I’ve taken a bath a few times after losing my footing.
I’ve never gone in in water that was over my head and most of my falls have involved a simple slip on a rock and a landing on my butt in water that was waist deep at most. These are “quick dunks” but what seems like a gallon of water will soak my shirt down to where the wading belt more or less stopped the flow.
On many of the days I have fallen, the rush of cool water was a welcome thing as the days are warm and the sun is hot.
Now, if I translate this to winter fishing or cold water fishing, I have to imagine most of the falls would be about the same, a quick slip, a landing on the backside, a quick glance to be sure nobody saw you and if they did, that they’re not laughing too hard, and then a quick return to the vertical feet down, head up position.
In a case like this, any type of waterproof shirt or jacket worn over the waders would have prevented the spillage of water into the waders. I don’t think it would have to be cinched tight enough to trap air in the waders or hinder movmemtn, just a layer overtop of the waders to stop the rush of water on the fall should do.
Now, if you take a serious dunking that involves a slide down the stream, a more robust solution would be called for. On the other hand, if it were really cold out and I went in over my head or fell hard enough to go completely under, having dry clothing in the car or in a zip lock bag in my backpack (if I were a couple miles from my car) would be in order.
I think keeping dry clothing in a water proof bag should be required equipment when winter fishing.
There’s no reason to die out there.
Jeff