Diy Dog Sweater Pattern . Use an old windbreaker, fleece, or quilted jacket to make your dog a custom. Dog sweater patterns knitting the broke dog top. Make A DIY Dog Sweater From A Sweatshirt + Doggie Travel Tips! Must from musthavemom.com How to make a dog shirt out of a onesie. Check out these tutorials from around the web. Lay the sweater down flat and pin the pattern pieces on it.