Hmmm, the folds of the pleats might be a problem because the outside layer of fabric has to stretch around the inside fold as it is forced into place. That would creat a difference in tinsion? between the inside and outside layers, even if they are completely fused together. I think that might result in a stage curtain wavieness with the length of fabric in a kilt.

Where as, with a single layer of woven fabric the yarns are a bit more free to move around each other. With two fused layers, the yarns are locked in place. I would guess that the swing would not be too good either.