Several good ideas up there, starting with the guy who pointed out that your previous sticky pocket holster will work just fine in a parka pocket. I'm assuming your "bigger .38" is a J-frame S&W, given what forum you're on. Another good point is that if you're threatened while in your car, you've already got a means of escape in your hands, plus, in extremis, a weapon that's got several orders of magnitude more muzzle energy than a .44 Mag. My personal solution is the same one DevilDog72 uses, though.