A flat collar is a type of collar that lies flat against the neck and is typically found on shirts, blouses, and dresses. It is characterized by its simple, open design, which can vary in shape and size. Flat collars can be made from various materials, including cotton, polyester, and silk, and they often come in different styles, such as Peter Pan or sailor collars. Flat collars are popular in both casual and formal wear, providing a classic and timeless look. They can be embellished with lace, embroidery, or buttons to enhance their appearance. This collar style is commonly seen in fashion items designed for both adults and children, making it a versatile choice in clothing design.