Seems to be such a complicated thing but nothing's easier really.
With an effortless vibe in mind - something close to the so-called sprezzatura - everything that matters here is the movement that we're going to apply to that small piece of fabric. We want to come up with something natural, easy to fold, unfold, refold and so on. Looking for the right gesture. The one that will bring impact to your two-button, double breasted or blazer jacket.
THE REVERSE PUFF
1. Lay the pocket square flat, face up
2. Pinch it
3. Lift it up from its center
4-5. Squeeze it from the top down with your opposite hand
6. Holding it firmly, flip the pocket square so that the peaks are facing up
7. Fold the bottom up
8. Adjust to fit the size of your jacket pocket.