Size A Neck approx. 8 - 10 in Chest approx. 12 - 15 in This pattern was inspired by "retro/vintage" designs... It is designed to fit like a shorty top.(see pix of rufus wearing purple sweater).. although, as a fashion choice many choose to get large size and wear them bigger... but hey, how your dog wears fashion is their choice. I spent 3 years custom making to various dogs of all breeds until I came up with these sizes. Designed for "DOGS" comfort. I usually ship on wed and saturday mornings