Here are some significations that I found...there are many more. For instance argyle shows that you are a geek or looking for one. Who knew?
Black S&M
Red Fisting
Dark Blue Anal sex
Light blue Oral sex
Yellow Watersports
Brown Scat
Green Hustler
Orange Anything, any time
Purple Into piercing.
Grey Bondage
Handkerchief or color on left signifies a top, on the left signifies a bottom. Good thing to know, the next time I go to the fetish club I will pay more attention to what I wear.