Thanks, Jock. And I know the thread is Highlanders discuss Highland Attire, but just as the Pound may fluctuate from time to time against the dollar, I wonder if the equivalency of jackets is entirely different.

Again, with no authority and an exposed target ( bracing even now) I would offer this brief chart for "American highland" wear:
Casual ( hiking, golf, what have ye) Kilt, sweater
Slightly dressy casual ( yeah, yeah- drinking, mostly) kilt and jacket, no tie
Business dress ( funerals, daytime weddings, Kirkin o the tartan, dinner out)
Kilt, jacket, tie No distinction between solid and tweed jackets, waistcoats may be worn
Black tie events ( balls, dances, weddings after 6) Kilt, jacket,waistcoat, bowtie no distinction between solid argyle and PC
White tie events (balls, affairs of state, affairs with movie stars) kilt, doublet, appropriate neckwear

This may be due to the general confusion of American Dress standards and is not meant to substitute for the "one kilt, ten looks" threads, but is just my personal observation. The non kilt wearers and the kilt wearers look the same above the waist through much of the spectrum. I do note in the pictures above that tweed predominates, but have seen pictures of the Duke of Rothesay in solid jackets. I guess if he is there, it is a Big Event...