Actually Dave, although Highland culture was something of a novelty in the antebellum period, the 79th NY Camerons were the only distinctly Highland unit. Even the 79th did not wear the kilt after their inital muster parade in New York City. Just as the Irish, many Scots fought on both sides of the conflict, but unlike the Irish, there were few ethnically based Scots regiments, or even companies. I have a relatively large base of articles concerning the 79th if you're interested, PM me.
~Sav