My favorites for Daisy*Mae are the sweatshirt hoodies. They are soft and warm and cuddly--easy to take on and off, too! I also make her fleece wraps that go under her belly to keep it dry.
We have other outfits like a snowsuit, sweaters, etc, but the hoodies are my favorite of all. She also wears them to bed.
As soon as the weather turns cold, she gets her "warmie," which is a tube sock filled with rice and rolled up in a flannel pillowcase. She gets one to take to bed, in her stroller or carrier, or when coming in from the cold. (microwave 1.5 -2minutes)
I am sorry to hear about the loss of your rottie. I know you will just love your new little one. Everyone on YorkieTalk will help you with any questions you have. We get excited when a new Yorkie Lover comes along!