If I'm reading it right, it is emphasizing the important influence of the uniforms of Highland regiments on civilian, formalwear kilting. Comments?
Well, sure, there's no doubt that military uniforms have influenced the kilt. Especially when one considers that for a time the only kilt allowed to be worn was a military one. Not only did the kilted outfit become militarized, it also became Anglicized. Had tartan and kilts never been banned, I imagine what we wear today would look different than it does.

That pictorial history leaves a lot to be desired, though.