I don't bother with color of shirts and don't have any problem. I think sometimes we over engineer concealing. A jacket when it's cold/cool works fine if you're careful too.It took me some experimentation to find out my best method of carry. I decided on leather IWB holster. For summer carry, I conceal under a dark t-shirt. For cold weather, I like a sweatshirt. You have to find something that fits your body and life style.