I have to say that my X-Kilt... camouflage box pleat made out of cotton-polyester, has almost no "swish" at all. The kinguisse knife-pleated digicamo, with 20 pleats swishes a fair bit, but neither rivals a medium-to-heavy-weight wool kilt, knife pleated.

That doesn't mean that I don't love those kilts, there's more to a kilt than "swish" but there you go.