Thank you all, I feel a lot better after reading your responses. Frankly I was worrying that I had asked a stupid question.

I've come to feel pretty comfortable with kilting but this formal stuff is still out of my comfort zone. In addition to the oxfords, I think I'll start looking for a black bow tie, an appropriate shirt + cuff links, and either a hunting sporran with a metal cantle or a horsehair sporran. If I come across some black brogued oxfords that work for me all the better.