A shirt protector is an item of clothing worn to protect a shirt from dirt, stains, and other damage. The two most common types of shirt protectors are bibs and aprons. A bib is a piece of clothing that covers the chest and ties around the neck. An APRON is a garment that covers the front of the body and ties around the waist. Both bibs and aprons can be made from a variety of materials such as cotton, polyester, and vinyl.