1. Start with a fully open square
2. Find the centre of the square...
3. ...and pinch between forefinger and thumb
4. Let it hang from your grip loosely
5. Flip the handkerchief 180 degrees so tail end is on top and grip around the middle
6. Poke it into your breast pocket and you have a Reverse Puff Fold. Tweak at ends to personal preference.