I know several gents in St. Louis Scottish society who wear great kilts with formal wear, and it looks quite distinguished. They pull it off very well. And neither one of them have anything to so with the Ren Fair crowd -- they simply wanted to wear a great kilt. They look a lot better than a lot of the guys in little kilts who have no idea how to wear them.

Also, there are mistaken ideas floating around about the kilt. Braveheart, for example, has a lowland Scot wearing a kilt circa 1300. Often you see guys at fairs wearing a great kilt accessorized as if it were an ancient viking garment. To get a more historically accurate idea of what was worn and when, watch Rob Roy (a better film then Braveheart too, IMHO).
Hear, Hear, Zeytoun! Well said, sir! I agree with you; Rob Roy was a far better movie from a historical standpoint, and really, I liked it better as a movie.

Oh, and the Sgain Dhu is not just reserved for "formal" attire. There are many examples of sgain dhus for day ware.

Cheers,

Todd