(Assuming you aren't doing electric jacket) Tank top seems silly if you are trying for max warmth.. why not a full t-shirt? Whatever you put over the T-shirt for me the next layer after would be something Fleece and then a soft shell. Riding jacket over that. I can't see wanting to sear a hoodie under riding jacket or to have it hanging out but I'm an old fart.
My commute is about one hour, 80 km each way, roughly half 407. I also do a number of day trips on weekends.
Here is what works for me down to freezing: I wear my normal street clothes that I would wear when at work or when stopping for coffee or lunch on a ride. I don't wear long underwear as I find I get way too hot when I stop but on a day long ride might wear a T-shirt under whatever shirt I would normally wear where I am stopping. So if commuting I would have my wool Suit pants, if casual then probably my jeans.
On top I would wear on top of the shirt: Heated Jacket, Soft Shell, riding suit. If much below freezing I may add one layer of fleece on top of the heated jacket under the soft shell. On bottom my regular Street pants (no long underwear), Fleece pants if very close to or below 0°c , my Riding Suit over everything.
Heated gloves keep my hands toasty below 10c. My regular Tilley Travel Dress socks work for commuting even below freezing, for longer rides I would add something warmer on my feet in my regular Alpinestar Web Goretex boots.
..Tom