A good alternative to the suit is the dress. This particular hountstooth one is from Zara. It is made from Viscose, very comfortable and the material is thick. Thus it does keep you warm and is super comfy. I wore it with a black blazer from H&M, some thick tights and some booties. I usually go to work like this.
Combined with my Canada Goose – Arctic Winter Jacket, I keep warm even in the snow. I have never gotten sick even in tights. One other recommendation for winter is to get insoles with wool for your shoes. It makes the difference.
~ Photo Credit: EhsaanQuadir