The path was mostly bare of people, but I did see a couple of walkers/runners and several cyclists.
In general, I don't wear cotton t-shirts, because cotton stops absorbing sweat after it gets damp, but in the winter time I do wear them. Cotton is a good insulator, if it is kept dry, and I don't sweat enough in cold weather such that sweat gets my t-shirts damp. Damp i-shirts and freezing weather don't mix, because the damp shirts freeze, and one ends up running with a big ice cube on his or her body. If I were running longer distances, I might not wear cotton t-shirts, because I would sweat more.
Click the following image, which was taken from the Internet, for a larger view (look at the pictures and large text and don't try to read the small text). Be sure the last layer is a wind breaker to stop the wind. I use an uninsulated layer of nylon (in a jacket) for my last layer. The jacket stops any wind but provides no warmth. I depend on other layers to provide heat-control. I dress light such that I'm cold in the beginning but feel fine after about 2 miles of distance. Other runners have chosen to dress with more layers such they feel fine at first but are too warm later on. As I get older, I may switch to the other method of wearing layers.