Military Monday: Capt. Slatter at Camp Borden, Ontario

This is Captain Slatter*, who is related (somehow) to my husband's grandmother Mary Slatter Wood. The reverse of this photo, handed down in the family, has a handwritten notation:

Camp Borden, Ont. 1917

Standing outside my tent

I only put my kilt on for special occasions in camp as it is so dusty with sand blowing all day.

Capt. Slatter's hat is the same as he's wearing in the earlier photo below, taken in Toronto, where he has on a dress kilt and is holding a baton. (A bandmaster?) 

Camp Borden was the WWI training grounds of Canada's Royal Flying Corps. Mary and her brothers John, Albert, and Harry Slatter (and sister Mrs. James F. Baker) came from England to Winnipeg, and the rest stayed in Canada. Exactly who Captain Slatter is, I can't tell (yet). Mary died in 1925 and her obit mentions her sister and three brothers.*

Thanks to Darcy, whose comment is below, the mystery of the uniform is solved: This appears to be of the 48th Highlanders of Toronto. I've written the 48th, with the photos, to ask for confirmation. A very good start! Darcy, your help is much appreciated.

*Update: This is most definitely renowned bandmaster Captain John Daniel Slatter. The 48th Highlanders identified him for me! See my later post here. For more, including the answers to my questions in this early post, go to the Slatter family landing page at top of this blog.