I have been to a lot of smaller train shows over the years. I have never encountered the hygiene issues that people go on and on about in the annual "let's count down to/obsess over/ complain about/ obsess over others counting down to and or complaining about York" threads.
I am known to wear bib overalls and or and engineers hat from time to time, sometimes not even at a train show. To me it is not any different than wearing your favorite players jersey to the ball park or the mall. Life is so short, if you can have some fun with out hurting someone, why not?
I don't look any more ridiculous than the people dressed up in the officially licensed merchandise of their local franchise and you see people who wear that stuff all year round. I must not be the only one who feels that way. There are quite a few engineers, conductors and vest that is entirely made out of R.R. patches guys at every show. It is not just train guys and sports nuts that do it. Odds are the guy you walk pass in February wearing his Harley hat, jacket,t shirt and boots did not ride his bike there in the 20 degree weather. He may not even own a bike. It reminds me of the joke, How come Rodeo Cowboys don't wear their hats and boots when they are not preforming? They don't want to be mistaken for truck drivers.
Getting to the model railroaders / railfans are fat topic. On average if you pick 3 American adults at random 1 will be what ever it is we call a healthy weight this week, one will be overweight, the other will be obese. So yea, if you look around a train show you will see a lot of fat old guys. If you look around a quilt show I suspect you will see a lot of fat old women. If you look around the DMV you will see a lot of fat people who are tired of waiting. We are blessed with an abundant and cheap food supply, some of the best health care in the world and many indoor jobs that require little to no labor. I suspect some if not all of those items will soon change and we will long for the days that the obesity epidemic was one of our major problems.
So maybe I just have had great luck and am living some sort of charmed life but the train shows I have been to are not magnets for fat, smelly, crusty clothed recluses who recoil like Dracula from sunlight. I will admit they seem to attract sellers who are convinced that this whole internet thing, what ever it is, is a just a fad. If they bring their cardboard six pack trays of common Lionel items that have been drug behind a motorcycle to just one more show, some one will pay asking price for all of it and they will be able to retire to the Cayman Islands with their millions. But that is a topic for another time.