This cat T-shirt is perfect for Sphynx Cat, Devon Rex Cat,Cornish Rex Cat and Peter Bald Cat. If your cats are not hairless cat but like our shirts, please order one size larger. If any of the measurements are "between" two sizes, choose the larger size. If your pet cat is growing up, you can order a bigger size. Take each measurement a bit loosely, so there will be room for your cat to move and breathe, but not too loose.