Why not just a double layer of the same fabric? If the length of the kilt were short enough then it could be a matter of folding the material in half, but keep us posted please. I would like to see one in Hawaiian print.
You could make a kilt from a more substantial fabric, but sew in strips of tropical pattern cloth such that they'd "flash" when the pleats opened.
Here's a picture of such a kilt that I made for Bethany Owen, one of the throwers here in Northern California. She has fabric with flames inside her pleats...yours would be Hawaiian print.
West Imboden, one of the throwers from southern California also has a kilt like this.
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