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Actually, if you've accidentally exposed your gun, it is legal as long as it is accidental and not intentional. Now, to prevent someone from calling the police, you'd have to be confident. DON'T beat a hasty retreat. DON'T argue a la Erik Scott. Just look them in the eye, smile, and say, "Howdy, Ma'am." Then, correct your wardrobe malfunction. They'll just assume that you're an off duty police officer or something. Don't make a big deal out of it.

I once DROPPED a Glock 19 at a Japanese festival/fair and didn't even know it (don't use the Phone Pal, the leather loop is weak and WILL fail). A Japanese gentleman tapped me on the shoulder and said in accented English, "You dropped your airsoft." (lots of kids were playing with airsoft guns that day) I bowed 90 degrees (a sign of respect), "Origato, (thanks)" scooped it up and dropped it in my backpack. I was really crowded and probably 30-40 people saw my gun sitting on the floor, but nobody called the cops because I did not make a big deal out of it. I just smiled, looked people in the eye and thanked the gentleman who pointed it out to me. I continued to enjoy the fair the rest of the day without incident.