Do you already have a coat or sweater for your dog that fits well? I made a coat for my JRT by copying one we had that was lightweight and fit her well. I used two layers of fleece and some velcrro for a closure tab under the belly. Its fits her well and I even used a tab from a clothesline cord to make the leash hook. It cost me under $7 to make. It's also washable which is important for a dog cost. Hope this helps you.