The term 'KNIGHT's tunic' refers to the clothing worn by knights in the Middle Ages. The two crossword solutions for this term are TABARD (6 letters) and gipon (5 letters). A TABARD is a sleeveless outer garment that was worn over armor and had a slit in the middle for the head. It was usually emblazoned with the KNIGHT's coat of arms. A gipon is a type of tunic that was worn by knights during the 14th and 15th centuries. It was typically made of wool or linen and was often decorated with embroidery.