YO, Fireball!
YOU first! Extremities...head, feet, hands protected. Hat; we lose 60% of our body heat from the head. Knit watch caps work fine, and me wife bought me a balclava. (terrorist ski mask) All my jackets have hoods.
Feet: wool socks inside loose-fitting footwear. Too tight, cuts off circulation, and cold feets or worse occurs. Running shoes are fine, but not waterproof.
Gloves: whatever you like...I use either lined chopper mitts with military wool gloves and/or fingerless gloves/mittens.
A thermos of your favorite warm beverage is a goodness, and does wonders for your core temp.
Don't wear cotton if you are likely to get sweaty or it is raining. 50 degrees and cotton clothing can cause the onset of hypothermia.
Camera: Extra batteries, kept in an interior pocket of the heavy coat. Change often. I shot for about 2 1/2 hours at the American Bobsled Championships... 7000 ft, temps ~ 24 deg. F. , camera outside my jacket, and it didn't miss a beat.
As mentioned: Large Zip-lock bags...put camera and lens(es) inside before you enter a building, exhaust as much air as you can, seal, give them time to warm up.
Have fun, and be well, not that the the cold weather you guys are experiencing will last too long.
