Crazy K’s AI assistant helped me decide between two sizes as my kitty’s measurements were right on the line. It turns out the S/M is perfect. I put it on her and there was no struggling or despair. She walked around like it was the most normal thing in the world. The only thing she didn’t like was that it made curling up somewhat uncomfortable for her but even then, she didn’t fuss. Now to try it out at the campsite….