Hanky Code

The hanky code is a color code system that men can use to indicate preferred fetish or sexual preferences by wearing one or more color handkerchiefs in their left or right pockets.
• In gay culture a man will often wear his keys on his left to indicate he prefers to take the top or dominant role, or on the right to indicate he prefers the bottom or submissive role. In the leather community an armband worn on the left or the right arm is used to indicate the same preference.