A pet costume is provided to accommodate a pet and provide insulation for said pet. The pet costume comprises a torso portion. The torso is provided with an aperture to accommodate the torso of the pet, and the aperture is provided with a lacing system to tighten and fasten the aperture to the pet. A hood is attached to the top of the torso and accommodates the head of the pet. An aperture is provided in the hood to allow the face of the pet to access the environment. One or more sleeves are attached to the bottom of the torso and accommodate the legs of the pet.