Several years ago I bought a little booklet at one of, if not the last Delco Scottish Games in PA. It is "All About Your Kilt" by Bob Martin. He makes a very strong case for the historicity of four yard kilts. Supposedly eight yard, knife pleated kilts did not exist before the late nineteenth/early twentieth century. Eight yard kilts look great but from what I remember of mine when it still fit They are not really comfortable compared to kilts with less fabric.

P.S. Hey Bear! Get working on Willie's kilt! (and mine too)