A full-length mirror can be a great addition to any home, whether you use it for getting ready in the morning or for checking your outfit before heading out for the night. But what exactly is a full-length mirror? A full-length mirror is simply a mirror that shows your reflection from head to toe. Full-length mirrors can be hung on a wall, propped up on the floor, or even mounted on the door of a closet. Many people choose to put their full-length mirrors in their bedroom, but they can really be placed anywhere in the house.