I was disappointed with the Don't Be Jelous T Shirts. I ordered M which always fit my dog. These shirts were so small it was ridiculous. I have returned them for the next size. The Swet Pea Shirt was also M and fit fine. It is too bad that your sizes do not coordinate with different styles. Otherwise I have been very happy with all of the products I have purchased from J.W.Little. One other thing, on the Scrappy Harness it was missing the loop that the lease attaches to. But I am using it by attaching the lease to the buckle. However, I have been very pleased with your response regarding exchanges and your products are of a superb quality.