The group sounds like a Hashing group. Is that correct S.I. ? SportKilt has some hashing groups represented on their Wall of Fame. The groups don't tend to be as focused on the Scottish side of kilts so I commend S.I. for trying to be courteous to the traditions of Scottish attire.

Have you considered making the "kilt pin" more like a sew on patch? That would allow folks to run in their kilts a lot more practical. I know you never said you run in the kilts and they are after run wear but one thing can tend to lead to another