Rex,

Nice looking kilt pin. I think that there are guidelines to wear the kilt pin is worn, at least there was a post somewhat recently asking the same question and a number of people chimed. For me, I never bother to measure, I just place it wear it seems to look right to me. For the XMarks pin, it is usually about the same distance up from the selvedge as in from the fringe. For a sword pin, it is usually up the same distance from the selvedge as the Xmarks, but closer to the edge of the outer apron.

I think it is really presonal preference and how it looks. Remember, the point is to provide some weight to the outer apron in case of wind, so somewhere near the lower, outer edge of the outer apron is fine.