I have found an illustration dated from 1945 of a gentleman in a Sheriffmuir outfit. So it would seem they were out in the market at that time.
The artist name was William Semple and the illustration is on page 111 of the book entitled The Scottish Tartans. I'm pretty sure these illustrations were done in the 30's as the book I have is the second revision and it is dated 1945. Most all the background people in these illustrations as well as the style used to render them would indicate a 1930's + commercial illustration project. JMO.




As for the white hose ... I played in three bands in the sixties. The first wore spats and hosetops, the next one wore lovat green hose and the third switched from full dress, military, to Prince Charlies and full tartan hose with buckled shoes. A new band I joined in 1970, again had Prince Charlies and this time cable knit white hose. We were told that tartan hose were becoming too expensive at the time. I do not believe there were too many bands that went on the competition field in Ontario,in those days, wearing anything else, except for maybe full dress. Seems it was that way for at least three or four years.