Nice tip.
When I first started wearing kilts I ordered an oversized safety pin with my kit, and it served me fairly well. However to me it seems a little plain. At the same time I'm not so fond of the traditional "sword" kilt pin design either. Plus, they tend to be somewhat overpriced for what they are.
I got the best tip in the world right here on XMTS, learning that vintage ladies' brooches on Ebay (or a local junk shop) can make fantastic kilt pins! In addition, once I had acquired more than 1 kilt, I quickly realized that consistently swapping out kilt pins is not only a pain in the butt, but increases the chance of damaging the fabric so I adopted what some members here do -- I have 1 kilt pin for each kilt. So now, when I get a new kilt, I hunt for a pin that would be "appropriate" or look nice with that given tartan. For example...

my Celtic kilt pin (Irish brooch) from EBay that resides with my Irish Saffron kilt.

My maple leaf three-toned metal brooch that resides with my Isle of Skye

My tri-colour maple leaf brooch that resides with my Stewart Hunting

My Asian dragon (it doesn't photograph well) that resides with my Nightstalker
I won't throw away that tip with the coat hanger stitch holder though. It could be very helpful in a bind.