Lay the handkerchief flat on a smooth surface
Fold it in half if needed to match the pocket size
Fold it into a square, rectangle, or triangle depending on the style you want
Keep the edges neat and aligned
Insert it into the breast pocket with the desired amount showing
Adjust the visible part so it sits evenly and securely
For a classic square fold, leave a small straight edge visible above the pocket
For a puff fold, pinch the center and tuck the edges into the pocket
For a pointed fold, fold into a triangle and place the point upward
Smooth out any wrinkles before wearing