Bark River Blackwater boot-knife, small and very nicely made but use a leather sheath, that kydex could give off the wrong vibes...
This Weidmannsheil stag lockback I got recently fits the bill here, looks old-school & decorative and not too bulky to be carried in the jacket or 'trousered'
Mcusta folder with ebony scales or quincewood is a good choice too,problem IS there are SO MANY good choices!
My dream special knife doesn't exist, it would be a lockback, sodbuster style in giraffe bone or mastedon/mammoth scales.......