Measure all sides of the chair, including front, back, sides and armrests. Find the area of each side by multiplying the length times the height of each side and add the areas together to find the total fabric area of the chair. Round up to the nearest yard and add an extra yard for backup when purchasing your new fabric.
Drape the fabric over the wingback chair. Stuff the fabric deep into the cushion cracks around the sides and rear of the cushion. Shove the fabric deep into any front crack as well if the wingback chair has a loose or half-attached cushion. Clip the fabric to the old fabric wherever possible underneath the fabric, keeping the clips out of sight and trying to clip every 12 inches.
Stretch the fabric over the back of the chair and over the sides, and clip the fabric together on both sides of the chair where the rear fabric meets the side fabric.
Stretch the fabric under the chair on all four sides and clip the sides together thoroughly, using as many clips as necessary to have a good, strong connection between the four sides of the chair. Remove excess fabric with the scissors.