An Alternate opinion
The string or shoelace 'holster' has indeed been around for a long time. I think I've used it once or twice, but it was just to see how it worked.
In a period spanning forty years, I've carried a gun nearly every day. The type of pistol I've carried most is a Colt Government Model (or Commander or GI surplus M1911a1). One of the commonest methods I've used is the basic Mexican carry. Yup, a cocked and locked 45 Awfulmatic stuffed in my waistband.
I seem to have lost out; I've never had a round go off down my trouser leg. Perhaps it was due to the fact I KNEW I had a loaded pistol in my britches and I had to treat it with some respect and care?
I discussed this with one of the highly trained and very knowledgeable range staff where I work a couple years ago. I thought he was going to need CPR, he was hyperventilating so bad. Obviously, he hadn't learned much on his own. Just what the range staff school taught him. Plus, he didn't really carry much off duty, it was too much bother.
I see a difference in philosophy of technique between people who actually carry guns and those who participate in 'sport shooting'. (If any IPSC shooters are offended by that, I'll try to live with it.) Yes, a pistol is dangerous. It it weren't, it wouldn't be much use.