For the post back kilt pins, this might help you from losing your kilt pin, should the backs not be secure. I keep several lapel-style pins on my (canvas fabric) pipe case, several of which would be upsetting if lost. On a trip to Disney, where "pin-trading" is the craze, we discovered these. They will lock a pin into place using a small tool that is included. When I've used them on my pipe case, they feel very secure, so I would imagine they would be just as secure on a kilt.

http://www.ebay.com/itm/Disney-Tradi...item258929784c