I helped set up a wedding reception at my church one time, and the table skirts we used had table skirt clips permanently attached to them. I'd start at one end of the table and push a clip onto the edge, then move on to the next clip and so on. I'd say these clips were spaced about a foot apart. If the table was longer than the skirt, I'd have to find another matching table skirt and keep going.
I remember some of the table skirt clips would be broken or missing, so we had to use those springy office clips in a pinch.