You're in Alabama? Norman will be fine. He will certainly not need boots, and frankly, he probably doesn't need a coat. That said, they can be fun to buy, and can serve some use for you, if not him. I have a thin, unlined, nylon coat for wet days, since Mia's coat absorbs water like a sponge. It doesn't keep her topknot or tail dry, but I don't have to towel off her body. In addition, since we visit family in the frozen tundra, where temps can be below zero, I invested in a fleece coat as well, which can be layered under the raincoat.
Finally, I prefer horse coat styles, and you can get good deals at Dover Saddlery.
Finally, I prefer horse coat styles, and you can get good deals at Dover Saddlery.