Funny you should ask this, My 1st day THIS year riding with snowflakes. I ride Ohio Year round. What Darn says goes. Hypothermia is a threat when riding in real cold weather. have no idea how nasty you plan to go, but if it is anywhere near the zero mark going down is a lot more likely and anything but full protection gear is nothing less than stupid. Armor everywhere Full Face, Armor heated gloves. Dress like a Snow Mobile rider would. I would go with a Bib style Pants Better seal when sitting and against rain. Your top and trousers should have removable thermal liner. Down to 15 degrees I can ride all day with only heated gloves. Near 30 I would have vents open on the suit. I would go with Gerbing Heated gloves only because they have the best heating controller. Worth the extra money. You say BIG but you never say size. Try to buy local. The sizes are never what they say they are.
Wool socks and regular riding boots will do. I use the Tour Master because they are waterproof and have real protection. When I am dressed as pictured I can ride 1000 miles in less than 24 hours below freezing, Been there done that, In fact a year ago. Don't forget to get your bike ready for that ride, Winter riding requires special dry lubes and other preventative measures.

You can see by this pic I have ridden while it's a little frosty.

This Picture is used by Leader to advertise their Desert Dawgs I highly recommend.
http://tinyurl.com/MS1700-s-bike

I was caught in some serious side winds, as you can see by the snow that stuck,
It took some expert riding and lots of luck to do that 60 miles, and THE reason I
went to a car tire on the rear.

Road salt and gravel from winter roads will sandblast your frame as shown above.

THIS home made Mudflap will prevent that, It hooks into my Desert Dawgs in seconds.

And people are not going to be expecting to see a MC in such cold weather, so,
Reflective gear is a must as daylight hours are diminished in winter. Make sure they see you!
Leaver Yourself an out! Aim High in steering! Get the big picture!

And, You can't possibly get more traction than joining the Darkside! That's a Van tire there and a LOT more rubber on the ground I might add and no one is going to argue that! If your a serious winter rider, you might want to consider more traction, your going to need it!
Who wants to race me on snow covered roads this winter? I was going to get Makcap to do it but he cheated and went to the Darkside too! Looking for a new contender with an MC tire, Anyone?