Your question needs to have more information provided in order for me to assist you better. When talking about chairs, have you looked on the underside of the seat area to see if it is screwed down and removable? Or are they like parsons chairs that are completely covered with fabric from the seat to the back of chair? You need to be more specific on type of chair before I can tell you how to do this. If the seat portion of the chair is removable(look underneath, and unscrew screws holding it on) Take seat off. Place seat of chair faced down onto fabric of choice, cut out fabric using chair seat as guide. Draw up side of fabric to be sure you have ample fabric to come to bottom of chair. Wrap seat as of you were wrapping a gift and staple with heavy gage stapler. Screw back on seat. If this is a solid fabric chair, consider buying slipcovers or making your own out of sheets.
