A lot of my over the clothes cold gear looks the same... Same red coats, minus a slight variation in the shade, same black over pant. But I've got lots of sweaters I rotate that I used as that like second top layer, so when I take off my coat I've got a bit more personnality will still staying warm with my layers underneath.
Hats/beanies are great to accessorise as well. Same with scarves or neck bandanas!