> Concealment and deception is also associated with cap, evident in its use in nineteenth-century English slang, where it conveyed deceit. To “set one’s cap” m

> Concealment and deception is also associated with cap, evident in its use in nineteenth-century English slang, where it conveyed deceit. To “set one’s cap” meant to “deceive, beguile, or cheat.” This connotation, if not denotation, of cap also occurs in the slang usages of bonnet. In the form of nineteenth-century British street slang known as cant, a bonnet meant a “gambling cheat or decoy,” as well as being simply a stand-in for “cheating” itself. It was also associated with treasure or money through being used to mean “bankrupt,” because a bankrupt person was made to wear a green bonnet. Weird that they don't make a reference to today's "no cap" (truthfully, no deception)