Yeah I composed myself into a fog.
If kilts are to become more popular as a (non-heritage) garment in the USA it will be as a leisure outdoor warm weather garment. Seasonal? Yes.
Lightweight material is the first thing I look for, and the first thing prospective kilt wearers ask me about.
Examples: The Sport Kilt Hiking Kilt, the Sport Kilt Tropical Fabric Kilt, the Mountain Hardwear Elkommando Hiking Kilt, AmeriKilts.
Up to USAK Casual.
Perhaps Celtic Croft Homespun.
Beyond that the fabrics are too hot.
I live in a USA Mid-Atlantic State. The bulk of prospective kilt wearers want their hot-wrap to come from a fast-food store, not to be wrapped around their waist.