slipcover

noun

Etymology: From slip + cover.

1. A fitted protective or decorative cover that may be slipped off and on a piece of upholstered furniture, usually made of cloth.

   “He is immobilized by depression, unable to finish painting the walls of his apartment, untie the bundles of books on his floor or take the slipcover and movers' ropes off his couch, even though he has been living there for three months.”