About cross kilt pins, I really wanted one back in the 1980s and at that time I couldn't find anyplace that made them. At the time I worked at a Highland Outfitter and we carried Carrick and Ortak etc but no crosses at that time.

At that time I travelled to Scotland for my first time and likewise no cross kilt pins to be seen at any of the dozens of shops I visited in Edinburgh, Glasgow, Skye, etc etc.

So I had one made! Either by Carrick or Ortak, I dont' remember. They had a lovely Celtic Cross pendant in sterling silver and I had them make it up with a pin back. I wore that pin for many years until I gave up wearing kilt pins altogether to avoid damage to my kilts.

Nowadays Celtic Cross kilt pins are common. I see them sold at every Games. But none, in my opinion, look as nice as mine.

About the "tradition" of kilt pins: Note that in The Highlanders Of Scotland very few men are wearing kilt pins at all, and none of the kilt pins resemble the sword or sword & targe etc kilt pins that evolved in the 20th century. The 1860s kilt pins seen in THOS are plain open circlets or ovals, or Clan Crest badges.

About liturgical colours: I have most of them covered quite nicely with my Isle of Skye kilt (purple, green, and white...well actually a very pale grey...)