Bill,

An ultimately traditional kilt pin would be a ladies (preferably the Queen's) brooch. For my Black Shadow Tartan SWK I wear a small pewter round doughnut shaped badge with scrollwork that if carefully read says "Siouxsie and the Banshees". On my SWK McCleod Standard I wear a little brass snake pin that my lovey wife gave me (she's a McCleod and vet who sees exotic pets)) so I find that most appropriate. Wear the pin that you like.

Cheers