Having built a holster to try the old "Confederate Cross Draw" position (for a right hander: the gun is carried in the middle of the back, on the belt, with the muzzle pointing about 45 degees downward to the left...ie to draw, you slide your hand between your back and the butt of the piece then pull to the right), I found it uncomfortable on horseback (the gun bounced off the saddle cantle), on a tractor (the same as horseback), in a chair (it pushed up against whatever I was wearing) and in the car (same feeling). It just wasn't useful and I wonder if it ever was used when horses were the most common mode of travel. Standing and walking were no problem, but the gun prints like you filled your drawers and the draw, as someone has pointed out, requires you in reality to fan the muzzle's arc past your body. Not a plan for success.
Those of us old enough to remember "Magnum PI" with Seleck playing the lead role, will recall he always carried a full length 1911 tucked in the waist band of his jeans crossways - over the crack of his......, in the above mentioned "Confederate Cross Draw" position. I always wondered how he was going to out-run the bad guys with 40 oz of Colt slapping away at his bum. He'd have been better off to tuck it, or better yet a Commander length 1911, in his right rear pocket...having carried one there for 30+ years here on the farm doing chores, I can tell you it's comfortable, secure, and you never need to wonder if you're armed or not...a good belt will keep your Levi's from sliding down like some Rap artist. But as a concealed postion, it's limited to coat wearing temperatures in the fall, winter, and spring.
That said, I have found the "FBI" carry positiion (for the usual 2-3" barrel snubbie), high up, behind the right hip for a right hander, in a slanted position with the butt angled forward, to be the most comfortable, on average for all of the above listed scenarios. It offers too a moderate amount of concealment with the average t-shirt...a summer time daily wear item, and reasonable draw speeds.
JMHO, Rodfac