Hello friend. No experience with kilts, but if you're looking for general suggestions, Thai fishermen pants are another alternative clothing to keep cool in the summer. Here in Toronto, nobody bats an eye when I wear them during hot days. They're inexpensive and you can get them in v/a basic colors to match your wardrobe, but the sewing pattern is so simple you could also get someone to make them for you using whatever fabric you want. Here's a example image:

