I have a Gunny living next door and he won't wear one, says he doesn't have the legs. He knows a couple other Marines that do wear them though. In Iraq, we had written rules on what could be worn, and for us it was all uniform items. Some of our Soldiers that were at other bases had different rules and could wear civilian attire. If there are no written standards forbidding civilian attire then talk to your SGT. I can see a bit reasoning behind not allowing it on deployment but once you're back stateside, wear it. Like has been mentioned, get the Leatherneck tartan and go for it.

YMOS,
Tony
SFC, USA