When my wife and I visit Charleston we like to visit the Charleston Museum and very often in their clothing displays I note at least a tartan waistcoat or two. On a visit a couple of years back there was a complete boy's Highland outfit, including diced hose, tartan kilt & sash, velvet doublet and glengarry. It was an unknown tartan and I was able to estimate a thread count and have it recorded with the STA.

The outfit was from the latter half of the 19th century and the owner's name did not sound Scottish at all! Perhaps on the mother's side? :-)