So far since it has been so cold, Molly hasn't been out. But I do have a new fleece lined parka with a scarf from PetEdge for her to wear. If I did take her out, I would layer on top of either a sweater or a hoodie.
But, thankfully she uses peepads, so going out hasn't been an issue for us. I feel sorry for any dog who does right now because it is so bitterly cold.