A "button-down" shirt is a type of dress shirt characterized by its collar, which has buttons that fasten it to the shirt. This design helps keep the collar in place and adds a polished look. Button-down shirts are often made from various materials, including cotton and linen, and come in a range of colors and patterns. These shirts are versatile and can be worn in both casual and formal settings. They are commonly paired with suits for business attire or worn with jeans for a more relaxed look. Button-downs are popular among both men and women, making them a staple in many wardrobes.