The longest-running shonen series and the one with the most stylistically inconsistent fits — which somehow works perfectly. Luffy's red vest and sandals aren't fashion. They're anti-fashion. Which is its own kind of statement.
Each island arc brings a completely new visual palette: Wano's samurai-inspired wardrobe, Dressrosa's Mediterranean color pop, Enies Lobby's stark white institutional look. One Piece is basically an anthology of aesthetics.
World-building aesthetic