They're really bugs on safety (which I like a lot), a few people are really serious about getting a high score, but mostly it's for hobby shooters to get together and have a little fun.
Potluck supper next month -- I'm going to try to have something to wear before then. This past Saturday, I just wore my jeans, my old roping boots, a Western belt and shirt, my breaking chaps and my Aussie drover coat, along with the moth-eaten old Stetson that I bought when I worked on a ranch in Nebraska back in '67. The feather hat band was dead, dead, dead when I took it out - the feathers had just decomposed to dust - so I brushed it off and wore it without a hatband.
But I'd like to be more period. If I'm a lady marshal, I'll probably wear mostly man's western attire (one blurb on Ms. Miller said that she aspired to be another Calamity Jane, but on the side of law-and-order instead), if I'm an Indian scout, I'll have to delve into what would be correct for a Crow woman - but one fighting as a man, and on horseback, and as a scout for the U.S. Army. Lots of room for interpretation there. I have a photo of 4 scouts from Custer's unit, between the four of them they have just about every possible combination of Western and Indian attire.