I don't know Sapporo, but I went for skiing when I was not used to snow / cold. Your cloches seem fine (depending the températures and humidity, and what you plan to do, like exercising outside).
Something that you may have disregarded is head gear: if you have sensitive eyes, light reflecting on the snow may be blinding. I have sensitive ears, so I needed something to cover them, especially when windy. And heat dissipates well at the head, so you can pick a beanie.
And gloves
there also small heat packs that you can put in your pockets.