I generally carry a SP101, .357 when wearing a kilt. And yes, it is in the sporran. Of course I have a knife in the top of my right sock and a large dirk in a sheath tucked in at an angle through my belt at the small of my back.
If the knife and the dirk does not stop some soft headed BG, the .357 surely will clear his mind.
Of course the occasions that I wear a kilt are usually with a group of happy, partying Scots that would rather drink than fight (Highland Games). But I have also walked across the Boston Common in a formal kilt kit (that includes the knives) and the .357 was comforting.