Richard, of North Baddesley, Hampshire, wrote: “Seeing that most are ‘not in a regiment’ you can wear what you like, just because the Scottish Army wear on underwear it doesn’t mean we have to follow suit.”

Well, I am not in a regiment now, nor have I been for 33 years. But when I was in a regiment, it was in the South African Army, not the Scottish.
And wearing underwear with the kilt was severely frowned on.
I got used to it, and I prefer it that way.
I have not worn underwear with the two kilts I bought this year. I may need to at some point, depending on circumstances, but so far I have had no problems.

And Dale, congratulations on your warrior name!
Regards,
Mike