The casual approach to kilt wearing is not a uniquely American phenomenon/fashion. Short socks and walking boots or 'sports' shoes are not uncommon on this side of the pond as are T-shirts and leather jackets (think Monarch of the Glen).
The only uniquely American things I've seen are the US military/police style shirts and US military/police accessories - Civil War belt buckles, police work belts etc. All of which are hardly nontraditional.
Given the globalization of fashion I doubt if a uniquely American look could really get off the ground. An idea will get the same reception across the world. Either accepted or rejected.
I suppose you could design a jacket with 'western' features with a cut away front or one inspired by military academy dress uniforms or even a bolero type that would not appeal to the non-American taste but would it appeal to the American taste?
Hands up who would buy a kilt jacket with western features?
The 'Eathen in his idleness bows down to wood and stone,
'E don't obey no orders unless they is his own,
He keeps his side arms awful,
And he leaves them all about,
Until up comes the Regiment and kicks the 'Eathen out.
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