When I'm wearing a suit I tend to keep to things like the alox bantam or small single bladed knives from the likes of Case, Fantoni or Lionsteel
I like that barlow
Such wonderful carry options. It's looking like aesthetics play a role as much as anything. I actually like the wood SAK option very much. Now I am regretting not putting the SS Esquire scales on my PTC . My little CRKT really could have fit the bill. I'm happy with my Cadet2 but certainly something "nicer" would be nice.
This thread should bring out all the eye candy
Or as a knife only, nothing beats a Laguiole in elegance.
Of those, I'd say the toothpick and the Esquire