Hal Fischer took the language of the instruction manual and applied it to the jocks and leathermen of gay San Francisco in the 70s. He explains the code
The Handkerchief Code Explained, Once and for All
Gentleman Meaningmen's Plaid Polyester Handkerchief - Classic Business Suit Accessory
Sex symbols: what does a blue hankie in your left back pocket mean?, Photography
That's right, MILLENNIALS won't know gang culture to see what's wrong! (x-post from /r/lewronggeneration) : r/gatekeeping
Hanky Code - What Is the Hanky Code and What Do the Colors Mean
What is the 'Handkerchief Code'? What do the colors represent? - Quora
Woman's Hankie Made From Mother's Wedding Dress
Men's Guide to Suits, Tailoring Tips
What's The Meaning Of Eddie's Black Handkerchief In Stranger Things?
Queer Flagging 101: How to Use the Hanky Code to Signal the Sex You Want to Have
The History Of The Handkerchief Code - LGBTQ Language
