I use an Instructor belt from Wilderness daily, including with kilts. Note; these are utilities and I don't work in an office but I'm not sure it'd matter. I'd wear something more appropriate for a wedding, for instance.

Kinda reminds me of that Karate Kid scene, where Ralph Machio asks Pat Morita "what (rank) belt are you?".

"J.C. Penny... $2.99".