A furniture cover assembly comprising side portions interconnected to define an interior area, wherein at least one side portion has an edge portion adjacent to an access opening to the interior area. The edge portion has a belt tunnel with opposing first and second open ends. An adjustment member is adjacent to the first open end, and a belt is slideably disposed in the belt tunnel. The belt has first and second free end portions projecting from and exterior of the belt tunnel. The belt's first free end portion is adjustably connected to the adjustment member and forms a first adjustable loop exterior of the belt tunnel and is configured to connect to a support structure of a furniture unit when positioned in the interior area. The belt's second free end portion forms a second loop exterior of the belt tunnel adjacent to the second open end and is configured to connect to a second support structure of the furniture unit with the belt tunnel extending between the first and second support structures.