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Determine how much material you need. Buy the slipcover material. Wash and dry the slipcover material. Iron the material before attempting to begin work on the slipcover.
The following are general guidelines for fabrics in solid colors; patterns may need more in order to match the different pieces up. Note that fabric is sold by the yard, which is the measurement lengthwise. Bolts of fabric at the craft store have predetermined width, which you'll need to verify before purchasing. Typical widths range from 32 to 60 inches (81 to 152 cm), with 45 and 60 inches (114 and 152 cm) being the most common. The following measurements are based on fabric that is 54 inches (137 cm) wide.  For a two-cushion sofa, use 16 yards (16 m) For a three-cushion sofa, use 18 yards (18 m) For a six-cushion sofa, use 22 yards (22 m) For a two-cushion love seat, use 13 yards (13 m) For a four-cushion love seat, use 17 yards (17 m) You can purchase it at a fabric store or online.  Consider a fabric in a solid color. Matching patterns or stripes across large panels can be tricky, so unless you're ready to put in this extra effort, look for a cover material that's a single tone. Opt for a fabric with a lot of drape – this will be much easier to work with. This softens the material and also accounts for any shrinkage that may occur. Don't skip this important step: the beauty of a slipcover is that it can be easily removed and washed, but you need to make sure it won't shrink after you've made it. Be sure to follow care instructions for the particular fabric you're working with. Wrinkles could cause puckering in the finished product, so this ensures a smooth and accurate fit.