Covering your sofa with a cotton throw is a DIY project. You can do it to safeguard your sofa or for simply enriching purposes. If you want to cover your sofa in a cotton throw, follow these hints.Underneath the couch cushions, tuck the cotton throw for the sofa in. For a neater appearance, you can also attach it to the sofa with velcro.To conceal the damage, fold it and drape it over one arm of the sofa in the back corner. This design will protect your sofa while also improving its appearance.