I've also had this happen, so I made my own magnetic-style kilt pin that's heavy enough to keep the apron down. I bought a couple of large rare-earth magnets at Lee Valley ( http://www.leevalley.com/wood/page.a...=1,42363,42348 ), hot-glued one to the back of a nice-looking maple leaf brooch I found on ebay, and they stick together through the layers of fabric (instead of putting pin holes in my kilts). These magnets are strong enough that they will attract each other through your hand, and they won't slip.