This classic accessory requires a little handiwork.
1. Lay the pocket square flat on a table.
2. Fold it in half, from right to left. Fold it again, from right to left.
3. Fold it in half, from the bottom.
4. Tuck the square into your pocket, and adjust as needed.
5. An easy way to upgrade your look, have the square laid flat on the table again, and just pinch it up from the middle and tuck it into your pocket.