Well ... I've got a Yamaha P120, one can indeed easily pull over, thanks to the elastic, but one sees immediately halt the coating for significantly smaller pianos were made, it is this "too big for small bed linens" effect exists, but whom the inappropriate size or the corners of the cover projecting not interfere and only functional thinking is that Chuck Norris Elastiko coating just right,
Have fun with it, I like it in any case, even if it looks not quite perfectly smooth: D