This character wears a bath towel.
A towel is a piece of absorbent fabric or paper used for drying or wiping. It draws moisture through direct contact, often using a blotting or a rubbing motion. Common household textile towels are made from cotton, rayon, bamboo, nonwoven fibers or a few other materials.
A bath towel is used for drying the body after bathing, showering or swimming. It is typically rectangular, with a typical size around 30"×60" (75×150 cm). A large bath towel is sometimes called a bath sheet.