It all happened many, many moons ago.  It was a dark and mysterious night filled with  wonderment in the local graveyard.  The weary souls decided in their drunken haze that the world needed guidance after the misgivens of the Trench Coat Mafia inccident.  These three enlighted souls (Jon, J.C., and Steve) decided to make the world safe again for people who just like to wear Trench Coats, and not necessarily kill people.  So about two weeks later they got off their asses and actually made "The Trench Coat Club", a friendly organization that everyone is welcome to look at, and maybe even join.
What's with the chain?
Well, the chain is a symbol of unity, all members of the TCC have their own, and wear them, some just to the barbeques though.  The chain is an honor to wear around your neck, not to mention a stylish fashion accessory.