In WWII, OSS agents in occupied territory would make a loop out of string. Then you pushed the loop under your belt (so you've got part of it above the belt and part below) forming two smaller loops of string. This field-expedient holster secured a gun effectively, but could be discarded wiithout drawing any attention. (If you were going to get caught, you could throw a gun in a river or something, but a holster would float.)
To AD a Walther, I'd have to flick the safety, cock it, and then fucking yank the trigger (first is DA, rest is SA).
Actually, if you cock it, the first round is SA. I do drills to pop the safety off and cock the hammer while presenting. They are particularly challenging as a leftie.
http://www.bianchi-intl.com/product/Prod.php?TxtModelID=4501 Massad Ayoob wrote an article about that last year. If you don't know anything about Ayoob, he testifies in dozens of trials a year on behalf of the defense as a real honest to god expert witness. He's not a god, but he had does a lot of good ideas. But, he did have one good point about "Mexican" carry, the rubberband technique, and that technique. They are all designed to keep the weapon from tumbling down down your pants leg during normal, non-strenuous, activity. The moment you begin to run, jump, etc. they lose any effectiveness they once had. The one thing they are not designed to do is to keep the weapon from popping up and out of your pants, which usually happens at the worst possible moment and he's been asked to testify to that in more than a few cases. I got no problem with you doing it, but I'd rather not have to explain to the clerk at the Kwik-E-Mart and the cops why my .38 went skittering down the isle when I bent over to pick up a pack of crackers off the bottom shelf.
Well, I back-pocket it around the house, but I think if I could carry, I'd be kinda nervous without it being retained in a holster.