I met my brother and his wife at a local barbecue place for lunch today and noticed a fellow patron open carrying. He was carrying some flavor of full-size XD at about 2:00 on his belt. He left part of the way through our meal, so I asked my two family members if they had happened to notice that the guy in the grey shirt had a gun. They both gave me surprised responses. One of them asked me, "Did you see it in his pocket or something?" They were more surprised when I mentioned that it was on his belt for all the world to see, and that he had walked right past them immediately after we had entered the store.
I know some people feel very self conscious when carrying. The above is a great example of why you've really got very little to worry about. Most people wonder around in Condition White. If they don't notice a balantly unconcealed weapon, they probably won't see your concealed one.