I live in Las Vegas, NV, in the Mohave Desert. It's a very windy and also a very hot locality. (As in 30 mph winds are listed as "breezy" and 105 degrees Fahrenheit in July merits the comment "We're having a slight cool wave through".) All my kilts are 11 oz, both top-quality wool tartan and alternative fabrics, and I've never had any problem with the wind. Mind, a strong air current blowing from BELOW would be a different matter, I expect. I understand that 11 oz is the lower end of suitable kilting material; lighter weights simply don't hang well and are also more subject to blowing up.

Will Pratt