Pet clothing is clothing designed specifically for animals, especially pets. It can be used for functional purposes, such as... morePet clothing is clothing designed specifically for animals, especially pets. It can be used for functional purposes, such as keeping an animal warm or protecting their skin from the elements, or for fashion purposes. Pet clothing is often made in smaller sizes and in a variety of styles to suit different types of animals. It is a growing trend among pet owners to dress their pets in clothing as a way to express their personality and style.