Hmmm interesting tack from most people... I don't get too cold (used to do competitive cross country skiing when younger) so it will be an experience to see what winter brings.
At the moment my winter waredrobe consists of a LineBreak
Long Sleeve Comp Tee, and a set of Netti sleeves.
I used to ski in shorts - and in bad weather i'd just wear a set of poly long thermals - so we'll see how I go, but I might be up for a pair of lightweight longs. boot covers will be interesting - but it seems to me that the harsh weather ones are made of Neoprene Rubber - claiming water proofness. A wetsuit is made of neoprene rubber and is hardly water proof - but perhaps it is a different variant.
Something with a tight lightweight seal (perhaps a rubber like bike tyres?)to ensure water doesn't run down your legs into the shoes, and then a goretex cover all to keep the water out but breathable? it just seems that most of the wet weather equipment seems to be geared towards european or north american winters in which sub metric zero is possible/common. Melbourne winter to me is about keeping the water out and the wind off your body mass.
Keeping the head warm is important, but too hot and you bake and become uncomfortable - so that will be interesting... again something exceptionally lightweight with good insulation properties is probably sufficient.