So are gloves. Don't forget a scarf and hat.
No kidding.
I don't own a lot of summer clothes. But pretty much every Canadian owns a winter coat, gloves/mitts, boots, scarf, and toque. When it gets down to -20C I wear two pairs of gloves, and that's when the heavy socks get used.
But there's the pesky matter of having to breathe and see where you're going. That means risking freezing nose, ears, and the rest of your face. And when going from outside to inside, my glasses fog up and I can't see a thing.
Also -35 ... Go away with Fahrenheit. Its not exactly warm in autumn and winter in the UK.
When have I
ever used that silly scale of measurement?

I was in Grade 5 when we went metric here in Canada. Temperature was the first thing that finally made sense to me.
Oh it was in C, I missed that. I always assume F is used when numbers seem that low or high.
But still ... All you have to do is put on more clothes though.
1. I don't do Fahrenheit.
2. You've obviously never experienced -35C, and colder (add wind chill to that; during a particularly bad cold snap of -55C in the '90s I finally learned what the phrase "it takes my breath away" feels like - it's not pleasant at all).
I'm okay down to -25C. I don't even bother with my winter coat until it's -15C (assuming no wind chill). But once it gets down to -30, only an emergency will get me to go outside. And since wet snow is heavy and can bring down power lines, it's time to check the supplies of batteries, candles, and canned food that doesn't need to be cooked.
Of course it's necessary to dress in layers, and be sensible. I don't get these people who think they can dress like it's summer and not have consequences. I see teenage girls standing at bus stops, shivering and whining about being cold... while wearing light jackets, summer shoes, and no socks. On one occasion, she didn't have the brains to do her coat up, and she had no gloves or toque. So she didn't have any sympathy from me.