As I'm sure you've pick up from Jock Scot's postings, in Scotland nobody really worries about "matching ties and hankies". As one of the traditionalist fuddy-duddies here, I can tell you that I don't go in for all of this "clan crest" stuff on belt buckles, sgians dubh, kilt pins, sporrans, and what-nots. Day wear and evening wear I use a blanket pin for a kilt pin, and my day wear sgian dubh has a horn handle. Eventide I swap it for a silver mounted one with a black handle. I have a rather simple leather sporran for day wear, and in the evening wear a full-face muskrat sporran or, if the event is black tie, I wear a seal-skin sporran with my crest discretely engraved on the cantle.

To me it seems enough to wear a kilt in one's clan tartan, and a "clan badge" in one's bonnet. I tend to think anything else is over-kill.