The new etiquette for men's handkerchiefs is one for blow, one for show and one to wear on top of your head.
Men wearing bandanna handkerchiefs tied on the head, urban gyspy-style, are everywhere. Bruce Weber, the photographer, is well known for that practice, and not just for hacking around in the garden. He went hanky-on-top to Anna Wintour's little soiree at the Paramount Hotel in Manhattan last week.
The bandanna is usually folded into a triangle, then pulled back over the skull and knotted in back. In a modern variation, the ends can also be twisted at the four corners, then slip-knotted and pulled tight to the skull. It all kind of brings back those Summer of Love days listening to the Dead play for umpteen hours in a row in the broiling sun. (Keeps bad vibes out, you know.)
Some men, however, end up looking like Holly Golightly because they let the tail of the bandanna slip out and stick up in back. That is a definite no-no. (And never, never wear them with big sunglasses.)