Instead of thinking about those light, cool to the skin yarns, I really ought to be thinking of warmer things. Things like this
From left to right, top row and clockwise, Harrisville Flax and Wool, Cascade Eco +, Noro Silver Thaw, Cascade Eco, Needful Yarns London Tweed, and several colours of Briggs and Little Regal. These are yarns that I like to think of as substantial sweater yarns. They are not all heavy weight, in fact most of them don't go outside the 4 or medium weight category, but they all will make substantial warm sweaters.
I have many more options. Plotulopi, Royal Tweed, Mission Falls, Prairie Wool, RCY Aran, Berroco Remix, Ultra Alpaca. These are just the yarns I can see as I sit here at my desk. I am blessed with a very lovely stash. A lovely, lovely stash.
It might be a while till one of these gorgeous things jumps up and demands to be knit first, though now that I think of it, there are the occasional whispers that are heard outside the closet.
Though my 'what to knit next' dreams are all warmer weather wear, I know all too well, that much of Canada is a place where sweater weather is only as far away as sunset. Wool. Keep it close at hand.