Quote Originally Posted by MacMillan of Rathdown View Post
QUOTE: If you tuck your undershirt or vest into your underpants then you must tuck your jumper/sweater into your kilt. (emphasis added) From: So You're Going To Wear Underpants, second expanded edition, by Charlie J. Thompsen, Bunshugger Press, 1982.

I trust that resolves the question.
I am so glad I had finished my afternoon coffee reading this. I would have sprayed it all over the monitor.

But seriously folks... I would wear this like all other sweaters outside the kilt unless the weather was so cold that it would be more comfortable to wear it tucked in.