Btw...I'm surprised none of our Historians have regaled us as to the origin of the kilt check.

Here's a bit:
Kilts have been traditionally worn without undergarments since their use as part of Scottish military uniform, leading to the invention of such expressions as "go regimental" or "military practice" for wearing no underwear.[2][3] On the Western Front during the First World War, some Sergeants Major reportedly had mirrors tied to the end of golf clubs or walking sticks to inspect up and under the kilt at parade inspection.