I‘d suggest something somewhat restrained, simple, yet dead sexy.
How about E Wire 2.0 Light, Black or Bronze, with a photochromic/Transitions custom cut; one O to rule ‘em all!
Like this (Ti Clear installed)…
I prefer a square frame when wearing suits. But I think as long as the color is more conservative, like a solid black or brown and not oversized like a Sutro, I think you will be fine. Always loved the agent Smith look, even though they aren’t Oakleys.