PTONUIC Pet Soft Velvet Outfits for Dogs Cats Fall/Winter Warmth Lined Puppy Dog Cold Weather Zipper Onesies with Hood Feature Type: Dog/Cat Material: Other Season: Autumn/Winter Collar Type: Round Neck Style: Boys/Girls (1 inch = 2.54 cm or 1 cm = 0.393 inch) The size has an error of 0.39-1.18 inches XS---Chest: 30 cm/11.81", back length: 20 cm/7.87"(approximately) S---Chest: 35 cm/13.77", back length: 25 cm/9.84"(approximately) M---Chest: 40 cm/15.74", back length: 30 cm/11.81"(approximately) L---Chest: 46 cm/18.11", back length: 35 cm/13.77"(approximately) XL---Chest: 51 cm/20.07", back length: 40cm/15.74"(approximately) We recommend that you be able to determine the pet's neck circumference, chest circumference and back length, and choose the correct size according to the size information in the instructions before placing an order. We specially design exquisite clothes for your pets and make your pets become more and more fashionable. Our clothes are made of comfortable fabrics, soft and skin-friendly, and incorporate a variety of design elements, such as rhinestones, pearls, ruffles, polka dots, flowers and so on. Our fabrics are not only keep warm in winter, but also have a sense of fashion.