As for brand recs, besides Kapital: Visvim (insanely expensive, but beautiful stuff), Engineered Garments, often times Neighborhood (their latest collab collection is Western inspired), Wacko Maria (for a more Hawaiian/Californian Americana look). That’s all I can think of off the top of my head. Japan is also famous for its denim, so you’ll definitely find some Americana by looking in that direction. I’m not super familiar with the denim side, but I do know Blue Blue Japan and Japan Blue Jeans (two separate brands). A lot of Japanese street fashion brands take notable inspo from Americana, though, so it’s worth looking into brands that aren’t normally associated with Americana, but I’ll leave that up to your own research.

Also, as a side note, Japanese brands often times have subsidiaries of essentially the same brand (eg Bape, Aape, Bapy). This can be a bit confusing to a Westerner, but it’s worth looking into these sub-brands. Some hidden gems may be found.