What teams do you like? These days you can get almost any team in any color. Also, if you span the decades, you can get a vintage style cap. The Red Sox used to have red caps in the ‘70s, for instance.
I am an old time SF Giants fan, but (sigh) again I don’t think that helps, since it identifies me as american. i think that pretty much leaves me with something like a plain red hat or wwg1wga (and even then maybe only on cruise ships).
(I dimly recall the unsettling sight of armed military standing guard inside the Rome airport after the first of the modern era jet hijackings.)
(Just looking it up... El Al Flight 426, from London Heathrow to Tel Aviv Lod...)