Indiana has no requirement to conceal your pistol. If you have a permit, you can tape the gun to your hat for all that the law cares.
In warmer months, I usually wear a pretty casual "gun burkha", most often in the form of an untucked, unbuttoned, oversized chambray shirt. I know the breeze can waft it open. I also know that because I carry the pistol at about the 4 o'clock position on my belt, if I bend over at the waist, then the drape of the thin, light-colored cloth makes it perfectly obvious to any knowledgeable observer that there's a heater there. It's not a big deal, and nobody's ever said word one about it, even here in the hippie haven of Broad Ripple.
Yesterday morning, I rode my bicycle to Fresh Market right around the time they opened. My cable lock was giving me fits at the bike rack out front, and so I spent some time bent over my Trek trying to get it sorted. When I straightened up to walk inside, the driver of the Brinks truck out front was giving me his absolute, 100%, totally undivided attention. And it took me a second to figure out why.
I hope the guy was thoughtful enough to figure that someone who was intent on jacking up him and his partner was unlikely to lock up their eco-friendly getaway vehicle, but I could have probably saved him a bit of stress if I'd squatted down instead of bending at the waist. And on the gripping hand, he needs to learn to deal with the fact that people carry guns.
It's a toughie. I wonder what Miss Manners would advise: Is it my obligation to strike awkward poses because someone else can't unclench?