What is a "tabard"?

A tabard is a type of sleeveless tunic worn over armor by knights during the Middle Ages. It typically has an open front and back and may be worn by both men and women. Tabards were initially worn by knights and other members of the medieval nobility as a part of their armor, but they eventually evolved into more decorative and ceremonial garments. In modern times, tabards are often used in costumes, uniforms, or religious vestments, and may feature ornate embroidery, applique, or other embellishments.