I was just reading about the Calgary Highlanders Regiment and came across this little tidbit, so I figured I'd add it to this thread...

Honorary Colonel Richard Bennett originally outfitted the Pipes and Drums with Royal Stewart tartan kilts and plaids in the 1920s; when the band of the 1st Battalion arrived in England in 1940 they were very quickly informed that Royal Stewart was the prerogative of Royal Regiments only and they were to cease wear of that tartan at once. Some musicians in the 2nd Battalion continued to wear the tartan for the duration of the war.