Or slip cover
A removable, washable cover for chairs, sofas and bedheads.
Furniture covers can be tailored to fit exactly and as close to the upholstery as possible, or made oversized and loose. Either option will suit a country house, but the tailored option is the only one for urban, sleek environments and the looser one for a shabby chic look.
Dust covers are very loose slip covers that should look as though the housekeeper has made them, allowing plenty of room for shrinkage in the laundry.
Piped seams add to the tailored look, flat piping or top stitching are options for contemporary schemes; dust covers are easier to launder with no added details to worry about.