When your pistol runs out of ammunition, priority one is always to reload. (Duh.) I've found that there is a plethora of gear manufacturers who make and sell pistol magazine pouches, but none who make exactly what I wanted.
My 1911A1 is (would be) my primary weapon. I have five magazines altogether, and a handy plate carrier that clips conveniently onto my backpack (we'll get into that later). All I need is a four-bay mag pouch that I can grab and pull a mag from easily, without the risk of it falling out by itself. I found the answer in "rare earth" neodymium magnets. ( I know that Tactical Tailor already makes a magnetic universal pistol magazine pouch, but in my experience, "universal" pouches don't fit 1911 mags terribly well.) In my design, the magnets are placed under a panel, inside the pouch, and closer to the body/armor, as opposed to the outside of the pouch (TacTailor's).
I used Cordura nylon webbing for a majority of the pouch, the back being recycled from an aging 5.56 mag pouch. Please excuse the fine thread, it was all I had to play with at the time.
These are the two surviving single-mag prototypes (I like how the tri-tone webbing looks on these)