Would you really want to be wearing a pin while running? I would think it would be cumbersome. Of course it all depends on the kilt being worn. If you were looking to just have something to identify yourselves as a group and you folks are using cheaper sport kilt type kilts, Personally, I would look for an embroidered patch that could be sewn or pinned to the kilt rather than a metal pin that has the potential to slap against your leg while running.