I understand where you are coming from and at least on leagues, I don't think it's a good idea. What about the people who may work until 6-6:30 or just don't have the time to change before league. It won't be that big of a deal for me because I wear slacks and either a polo or button up shirt to work anyway (and because of how far I drive to get to league, I wear those to bowl as well). I can see it in tournaments, but at least for me, its a chance to wear jeans to bowl at least in the local ones. Granted, they're a nice pair of jeans, and I usually wear a decent shirt as well. But personally, I don't mind if I see somebody wearing shorts and a t-shirt in league, or most tournaments. As long as they fit and don't have a bunch of holes in them, I don't see an issue.