I've often thought about trying to come up with some sort of Irish uilleann costume, perhaps something as simple as wearing kneebreeches instead of trousers.
I think that's a fabulous idea. While a kilt may not be entirely appropriate for playing uillean pipes, and normal pants (or a modern suit) would be a travesty for a Burns supper, maybe doing something halfway inbetween would be just the ticket. Kneebreeches were, as I understand it, fairly universal. It would lend itself toward a historical and unique look while satisfying both Scottish and Irish looks.

Besides, I like the look of kneebreeches. If we can't wear our kilts all the time, I'd like to see these make a comeback on their own merits.