Turn the chair upside down and remove the cambric, the black porous cloth covering the underside. Unscrew the chair pad from the chair with a screwdriver.
Remove the tacks or staples on the bottom of the chair pad and those on the underside of the chair frame if the cambric was attached to the frame. Remove the fabric from the chair pad.
Place upholstery fabric face down on the work table. Center the chair pad over any pattern or design on the fabric and align the pad so that any stripes are straight.
Pull the top center of the fabric to the back underside and staple 2 inches from the edge. Pull the bottom center of the fabric to the back underside and stable 2 inches from the edge. Stretch the right side to the center and staple and then the left. Continue stapling and stretching away from the center moving from top, bottom, right and left. Staple every inch.
Make four small folds at each corner stapling them evenly. Trim off the excess fabric. Place the pad onto the chair and screw the pad to the frame. Fit new cambric to the bottom of the frame. Cut the cambric 1/2 inch larger on all sides and fold the fabric under and staple the cambric to the frame neatly.