No. The inner and outer layers of the Gooby Raincoat Pro are designed to match and fit together specifically for the corresponding size of the raincoat. They are not intended to be mixed and matched with different sizes of inner or outer layers. Each size of the raincoat has inner and outer layers that are proportionally designed to ensure a proper fit and functionality. Mixing different sizes of inner and outer layers may result in an ill-fitting raincoat that does not provide the intended protection or comfort for your dog. Therefore, it is recommended to use the corresponding inner and outer layers that come with the specific size of the Gooby Raincoat Pro for the best results.