If you have a dog larger than a Frenchie (sacre bleu!), it's easy to improvise: This is essentially just a rectangle and two straps.
Tools and Materials
1/3 yard of fabric (for a 20-pound dog)
Erasable fabric marker
Needle and thread
Doggie Coat How-To
1. Cut fabric into a 14-by-11-inch rectangle and two 1 1/2-inch-wide straps, 13 and 14 inches long (for other sizes, test with muslin or newspaper); round the corners.
2. Drape over dog. Mark where buttons will hold the straps, across the lower neck and behind the front legs.
3. Sew buttons onto main piece; cut slits in straps. (As dog grows, make longer straps.)