A window covering for a window having a window casement, or other opening in a wall, such as a doorway or a case-less window opening, with an inside portion adjacent to the window and an outside portion adjacent to the inside portion, the outside portion having a left side portion and a right side portion is disclosed. The window covering comprising includes a support assembly configured and arranged to attach to an inside portion of a window casement and a window treatment suspended from the support assembly and overlapping at least a portion of a left side portion and a right side portion of an outside portion of the window casement whereby the window treatment covers the window.