I'm with Dale. It may be a "from life" concept, but by reading way too much into the picture I can say that while these lads may be quite manly and athletic, they've clearly only strolled from the table to the library for a smoke and some dirty jokes while the ladies retire to the drawing-room.

A sgian worn outside the hose would flop, at any pace faster than a mosey. (Did they "mosey" in Scotland?) Just looks like someone carrying the supposed tradition of revealing any knife retained about the person a little farther than most.

And geesh! He's smoking a cigarette when clearly the etiquette calls for a pipe, or in the absence of a personal briar, a cigar.