I threw on one of the thinnest shirts I own. It's one of my old hanes under shirts. Paper thin... Lol
Of course this would print if I bent over, or maybe if I twisted just right. Just a demonstration as to how easy it would be to conceal. Not sure, but both compact versions (XD45 compact & XDm 45 3.8 compact) shouldn't be much of a size difference. Also, kidney carry works for me. Might take some getting used to. I've been carrying this way for close to 9 years. You get used to it. That's my view point.