Frogman, evidently, you haven't spent much time in El A, as soon as you get there, you know you're in a different world, and West Coast jazz reflects that casual, cool, laid back life style; there is no such thing as a necktie in almost all of El A.
https://www.youtube.com/watch?v=Y2nbtYg8YGA
While there are exceptions to any "Generalization", a generalization can be made in regard to West Coast jazz, and it absolutely reflects the lifestyle of the people.
https://www.youtube.com/watch?v=fwAAjnqdB4w