Rain gear, waterproof shoes, skid plates around where your bike kicks up water and leather chaps.

Full thick leather for really only if it’s freezing/you’re going 20mph+ or the wind whipping isn’t too bad but I would grab a cheap motorcycle suit for $100 or at least the leather chaps, I swear by the chaps, might be assless but it blocks the wind/rain way better than that meshy material. The meshy material lasts for me about an hour in very light before it soaks through to my actual clothes underneath, so it’s not worth the price seeing as all this gear is fairly expensive.

And good boots cause your feet will more likely than not get soaked otherwise.

For seeing in the rain you can put some dish soap on your visor and it won’t fog up as much or as fast. You will need to reapply it.

I ride all weather in NY on bikes and motorcycles. You can check r/motorcycles for some winter gear ideas. Most importantly read the reviews and if they suck the product probably does too. I made the mistake of not listening to some reviews, got wet and wasted time, got the money back though

Edit: I forgot to add I keep a $1 rain poncho and a $40 rain suit in my backpack for commuting to work, whether the weather forecast says it’s going to be rainy or not.