Your kilt/knife picture is a good one! Yep, you are right about the sgian dubh being the wee knife in the sock. A dirk goes the belt. I rarely carry a dirk, as they always clank around and do raise eyebrows.
A Clinton Special is a good idea.
Cheers,
Alan RKS #5531
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Alan Grombacher RKCC-CMI-010 RKS#5531