Quote Originally Posted by Jock Scot View Post
I think that you have the picture time line about right there OCR, perhaps the top left one might be a tad earlier, but not enough to matter. Going off topic a tad, it’s interesting and striking that the headwear is common in all the pictures. I see a “deer stalker” as an exception, in one of the pictures but generally the bonnet choice is a common choice for nearly all of those marching. These days I suspect the front rank of a similar march today would wear a bonnet and the following ranks, even in inclement weather would be mostly bare-headed.
What's more, I'd wager that several of these are the exact same bonnets, photographed multiple times over many years. I recognize at least one of them, worn by the Duke of Argyll.