It will take me a while to find the exact reference again, but I have seen the pins used referred to as common straight pins in the form of a cross in the lapel (I think on the left side). These men were also identified by a corn husk braided into their hair behind their left ear. I have never seen any reference to the significance of the left side. In my research there is limited information that exists on the Pin organization, since it was secretive and to admit to membership or to reveal secrets to an outsider was punishable by death. Thus, the majority of references to Pins are from their Confederate enemies and biased against them. Hope this helps, I'll try to get my resources lined up for you.