One of my prized possessions, this was sold at Wendy's fast food stores in the 80's (there were about four different colored/patterned hats...needless to say, I prefer the black one).
This photo is of my black jazz cap Mark II (I wore my first one for about two years straight, and it got all funked up...to put it mildly), which I wear sparingly, so as to preserve its specialness for decades to come.
I expected to find some facts about Wendy's jazz caps online, but apparently there's nothing really out there.
It is perhaps fitting that they remain an enigma...