All these things strike my eye as being quasi-historical rather than traditional (going with the definition of "traditional" as being handed down in an unbroken continuum, and a constant process of evolution).

Because by the mid 19th century, and up into the early years of the 20th, ordinary neckties had come to be worn with the kilt both in informal and formal Highland dress.

The Highlanders Of Scotland presents an amazingly wide spectrum, an almost unbelievable variety, of the Highland Dress of the 1850s (with numerous shoe styles, jacket styles, sporran styles, hose styles, headdress styles, dirk styles, and so on, which no longer exist) yet all the men are wearing ordinary white shirts and the ordinary neckties of that era (nearly always plain black).

Nothing remotely resembling a jabot.

I also have hundreds of photographs of men in Highland Dress from the mid 19th century up through the early years of the 20th which show the same thing.

But in old Highland Dress catalogues from the 1920s and 1930s jabots do appear, worn with the new Evening jackets with closed standup collars, the Montrose and the Kenmore.

The Prince Charlie, also new at that time, is usually shown with wing collar shirt and bow tie, but sometimes with jabot.

So to me they are much of a muchness, the Prince Charlie, the Montrose, the jabot, the modern Day and Evening sporrans... the new Highland Dress which evolved in the early 20th century.