A button-down collar is a type of shirt collar that features small buttons on the collar points, securing them to the shirt. This design helps keep the collar in place, providing a neat and tidy appearance. It is commonly found on dress shirts and casual shirts, making it a versatile choice for various occasions. Originally popularized by Polo Ralph Lauren in the 19th century, the button-down collar is often associated with preppy fashion. It can be worn with or without a tie and pairs well with blazers or sweaters, making it a staple in many wardrobes.