What Jock said and, you don't have to have the ever common sword Kilt pin.
Many go with a brooch or something that has meaning to them. I wear a Australian Rising Sun badge that my father wore in WWII, others wear something to remind them of their service, or perhaps a brooch that Grandma wore. Others make their own, What can be used is up to the imagination

There was a thread recently "Show Us your Kilt Pins", http://www.xmarksthescot.com/forum/f...lt-pins-64703/