I think if you are buying a kilt specifically for black tie events then I wouldnt buy a weathered tartan. One of my kilts is a beautiful Mackenzie Weathered kilt but due to its weathered colours, to me, it just doesnt look quite right with a formal black jacket, white shirt and black tie. If I wear my normal Mackenzie Modern kilt for black tie then it looks fine.

I can wear the Weathered Mackenzie with a black or brown shirt, tweed tie and charcoal jacket. This would be ok for a formal event but probably not acceptable at a black tie event.