With the square folded into quarters, fan out the corners to create
the points, then grab onto them.
Keeping the points tightly held, fold over one side corner of the
square toward the center.
Fold the other side corner over, keeping a firm grip on the square.
Now fold the bottom corner back, halfway up toward the points. It's
ready to be tucked into your jacket pocket.
Let the points stick out of the pocket as shown. It doesn't need a
lot of fussing to achieve this smooth and sophisticated look.