I bought this after watching a video of a beagle in a bathrobe, wanting to try it out myself. We all burst out laughing just once when I put it on him, and that was it. The size is approximately 36 cm (excluding the hood) for the longest part of the back, and 26 cm for the longest part of the side. The longest part of the belly is approximately 23 cm. The neck circumference, measured around the outside, was approximately 41 cm. It's easier to understand if you compare it to clothes you already have. Please feel free to continue using it! I am also selling other items. Size...XL