There were kilts in early 19th century Los Angeles:

"In Hispanic California, for example, Hugo Reid, originally from Cardross, married a wealthy Gabrieleno woman, Doña Victoria. By this union he inherited two ranchos and two adopted sons, Felipe and José, who soon sported imported kilts and went by the surname Reid. Unfortunately, neither lived long enough to continue the line."

Scots in the North American West 1790-1917 by Fernec M. Szasz (University of Oklahoma Press, 2000), p.66.

However, I'm not sure of the historical accuracry of said vaquero jacket.

T.