Sweaters are an essential part of a girl's wardrobe, providing warmth during colder months. Whether worn alone or layered over another shirt, sweaters can be part of a casual or dressy outfit. Girls' sweaters come in both crewneck and V-neck designs, as well as in nearly endless colors and patterns. Sizes are typically based on years in age, from 4 to 14. However, they also may be simplified into small, medium, and large.