A quirky thing about the kit of the Scottish regiments is that while on the one hand they occasionally introduce new non-traditional (and sometimes downright hideous) things, while on the other hand they're a bastion of older traditions, things that predate our modern "traditional" Highland Dress (which emerged following World War One).
Striped flashes is one of those things, they survive in the pipers' kit in 4SCOTS (green) and Scots Guards (red).

The pipers of 4SCOTS
Pipe Major Scots Guards

About flashes colours and the wearing/not wearing of them, once again I find it helpful to turn to The Highlanders of Scotland, by far the largest corpus of mid-19th century colour portraits of men in Highland Dress.
While these portraits don't tell us much about modern "traditional Highland Dress" due to Highland Dress undergoing a major overhaul after they were painted, they do give us an in-colour overview of what was worn in the 1860s. (For B&W images showing all of the same things we have thousands of Victorian photos to look at.)
Interestingly wearing visible flashes wasn't all that popular. In The Highlanders of Scotland only 16 of the 56 kilted men have flashes showing. Just why wearing visible flashes became routine by the 1920s who can say.
Except for three striped flashes, all are plain red. Interestingly plain red flashes were worn by all the surviving kilted Scottish Highland regiments (excepting some pipers as mentioned above).
Two of the plain red flashes do have contrasting edging, one black, one white.
Four men in "day" tweed in The Highlanders of Scotland, no visible flashes, no kilt pins, no sginean, three of the four wearing ordinary brogues.
Last edited by OC Richard; 23rd July 25 at 01:33 AM.
Proud Mountaineer from the Highlands of West Virginia; son of the Revolution and Civil War; first Europeans on the Guyandotte
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