This wasn't working for me until I realized how important it is to bring your 2nd pinch hand BEHIND your 1st pinch hand when you reach for the 3rd pinch. It doesn't work if you bring the hand in front of the other one.

And I couldn't make head nor tail with what this guy was saying, the quality of the audio is so poor. I just did a YT search for "how to fold a t-shirt" - the first one that comes up is the one to watch. I don't actually care that this is supposed to be a "fast" way to fold a t-shirt - in my case, I didn't know how to fold one at all and have just crammed them in my drawer. This is actually one of the most satisfying skills I've learned in ages!