I picked other.
I don't think I've personally seen a pirate at a Highland games, but I do always notice what I call the "I own all this stuff, I'm gonna wear it" guys cruising around the field in their formal kit they drag out twice a year.
But I got past getting really worked up over the way other people might dress after high school.
You do see a lot of different "variations" of Highland attire at games, and I'm sure the worst of them are being worn by folks just as grimly determined that their versions are as correct as others think they are wrong.