Thinking back to "Tesco" and similar situations, at one time officers in uniform would never have gone shopping. Times have changed though. What does "Customs of the Service" suggest, or does it no longer apply. And of course forty years ago (it is that number of years next week since I retired) if one moved around the station in flying kit one wore a hat. One didn't leave the station dressed like that. Any more than you would expect to see an engineer in greasy overalls off the base.