The Tour is similar to another event, the Frosty Bottom, but if I recall, the Tour has a different end point than beginning point and is shorter. What you wear really depends on the conditions. A big generalization is that you want to dress like an XC skier, because that is the sport that most closely matches the output and speeds of riding a fat bike and in many cases, they may be passing some of the riders. From there, we could be having a cold spell (like we are right now) or it could be in the upper 20s. It can go both ways at that time of year, but it's usually starting to lean towards warmer temps and more sunlight. Hands and feet are usually the biggest issue for people, but don't over-do your core. I find 95% of the time that a base-layer+soft-shell type jacket is plenty and keeps you from getting too warm, you can unzip it if necessary. The base layer doesn't really matter. Wool doesn't dry as fast and retains more moisture, synthetic is warmer for the weight and wicks better. A balaclava on the face helps if it's in the low 20s and colder. For the hands, most riders use pogies. You might be able to get away with some mid-weight mtb gloves depending on the temp and your circulation. The problem with thicker gloves is they will compromise handling and usually cause you to sweat a lot more, but then again it's not a very long race for most people. Another thing I do is tape some foot-warmers to the handlebar grips (footwarmers are thinner than handwarmers and partially adhesive, so they work better here) and then there are foot-warmers for your boots. Almost no one can use summer type shoes here in the winter, you need real winter cycling shoes if you run SPD or some hiking boots if you are running flats. If you have poor circulation, supplement with some foot-warmers. They'll last around 3 hours pretty easy before you'd even think that you might be getting chilled. Running a camelback under your jacket and routing the hose under your armpit keeps the water warm and unfrozen. Insulated bottles can work, especially if you fill them up with hot water before the race (since it's not a long race).
All of this again really depends on what the weather decides to do. A few years ago when we had a real frosty Frosty Bottom, it was around -20 at some points. I had band-aids over my nipples and one over my nose. If you try to cover up your nose more, usually all you do is fog glasses, but there are some other things like nose-hat. A band-aid or bandage is a cheap way to achieve something similar. I may have had 2 base-layers in that case and 2 layers on my bottoms. The bigger deal was keeping my hands and feet warm, which I was able to.
All of this again really depends on what the weather decides to do. A few years ago when we had a real frosty Frosty Bottom, it was around -20 at some points. I had band-aids over my nipples and one over my nose. If you try to cover up your nose more, usually all you do is fog glasses, but there are some other things like nose-hat. A band-aid or bandage is a cheap way to achieve something similar. I may have had 2 base-layers in that case and 2 layers on my bottoms. The bigger deal was keeping my hands and feet warm, which I was able to.
