To renew a seven-foot sofa, you'll need four pillows, which will overlap, covering the sofa back completely. Keep sewing costs down by opting for plain envelope closures and skipping fancy edges such as welting. The fabric on a large (26-by-26-inch) pillow is 100 percent cotton clipper (a type of canvas) in Delft; $20 a yard, Calico Corners, 800-213-6366, www.calicocorners.com. The 18-by-14-inch throw pillow is covered in 100 percent cotton Bandido; $12 a yard, ABC Carpet & Home, 212-473-3000, www.abccarpet.com. Pillow forms, in a range of prices and sizes, from Cuddledown of Maine, 800-323-6793, www.cuddledown.com. Matchstick shades (32 inches), $9.50, Pearl River Mart, Inc., 212-431-4770, www.pearlriver.com.