It is very sad how some pilots dress. We have pilots at F9 that I swear slept in their uniform and simply rolled out of bed. People wearing their own tides, sneakers, etc. I often joke that our uniform is a combination of Columbia, north face and a little Patagonia.
Take a little pride in your appearance. It is very simple to do and no need to argue mil vs civilian, but rather professionalism. You are responsible for a multimillion dollar aircraft and hundreds of lives. Take a little pride on what you have accomplished.