I can't speak to how heavy the regular Sport Kilt is. Mine is the all-cotton "comfy kilt" model, which is a relatively lightweight cotton flannel. Mine is Royal Stewart, although it is also offered in Black Watch.
I've never had a problem with chafing, but I've only run 5-10K races, so it may be an issue with longer distances. At 160K, I imagine you will run into a number of issues that I have not needed to consider.
Although the rest of my race outfit is kilt-themed, I wear Adidas running shoes, rather than brogues or boots.
There are a number of shorter kilt races around the country (the races are shorter, the kilts are normal length). Seattle's "Great Kilted Run" is probably the best known.
Andrew
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