I came across this very interesting postcard



which lead me to read up a bit on just what the "Imperial International Exhibition" of 1909 was. There's a Wikipedia article and all.

Anyhow the dress is interesting, being I presume an attempt to show stereotypical Highland Dress of the time. Note that most men are in the typical dress of that time, the open-collared doublet, long hair sporran, wing collar shirt, tartan hose, &c though one gent is in tweed with the typical Pine Marten sporran. The piper's sporran seems to represtent an early 20th century evolution towards the small pocketlike sporrans which became standard after WWI.