I ware a 3mm o’neil suit through the winter. A lot less restrictive than a big old steamer. If your only in 20 mins at a time it's more than warm enough. At the end of the day your hands and toes aren’t covered so they'll snap off before your body gets cold. Get one of them gimp hoods if you wanna keep some extra heat in. Plus you can pair it up with a tomato in your mouth for a bit of extra style
Australia - hu . . who'd wanna go there when you can break the ice off your boat and ride in an old quary filled with ransid near freezing water. :?