Personally I don't much care for the jacobite/jacobean shirts - too much like escapees from a re-enactment group for my taste. An ordinary shirt with tails would surely serve the desired purpose but in this respect I share Hamish's puzzlement at this obsession some seem to have that they must have something between certain parts of the anatomy and the kilt.

I also totally agree with Hamish's suggestion that if you must wear one then it is best worn casually - unfortunately too many seem to be wearing them with a waistcoat as "alternative" formal attire, where I think it looks like the equivalent of wearing a sports jacket and open-necked shirt to a "black tie" do.