I just have to say that I LOVE this look. I am going to pick up One Off tomorrow, its gorgeous on you.
My boyfriend has a scar across his back that is not unlike yours. He had open heart surgery when he was two to place a Teflon patch on his aorta. He had a congenital defect, that if untreated would have killed him by the age of 5. He is also self conscious about it, because people tend to ask about it. I don't understand why, to me it is a sign that you survived something that other people won't understand. I wouldn't let your scar hold you back from wearing, or doing whatever you like.