In 1955, the Air Force introduced its new summer uniform (above, getting a second look from conventionally dressed airmen at Mac Dill AFB, Fla.). In addition to the shorts and pith helmet, options included a bush jacket and long pants, but the look never really caught on.
This style never quite made it either, but the Post Office adopted it.
Don't think the senior officers' garrison cap of this pith helmet style would have looked good with "farts and darts" style scrambled eggs.