Generally that is true. And here in Denver that is definitely true most everywhere, although a big, international airport like DIA is hardly representative of Denver or any attached city. But it would be a good place to get your sea legs with dressing. A real confidence builder. But parking at DIA is almost always difficult to find and expensive.
Doc, I think you may be too self conscious. What does it matter if some one snickers or frowns. That is not our problem; that is their problem with being intolerant of diversity. If you dress to blend those things are not a problem.
