1. Lay the pocket square flat so it resembles a diamond.
2. Fold the bottom corner up to meet the top corner.
3. Fold the left point in past the center, aligning the folded edge (fold it in thirds).
4. Fold the right point in as well (again, folding at the one-third mark); wrap the point around to the back.
5. Turn the pocket square over, and tuck it into the jacket pocket with the point up.