AZWildcat96, they are not too expensive. That is precisely why I got a few pair (ftom the STM, incidentally) without really loosing any sleep over the cost of purchase. I got some complimentary and contrasting colours for some of the versatility you mention...

2nd to One, here's a thought ... would it be possible to make the spare tartan into ties? I suspect not, but has anyone ever tried or thought of that before?