Quote: The History and pride of those regiments are things of legend. Its really to bad about this. my Great Uncle Joe Brown was in the Royal Scot Fusiliers
Great photo!
Looks like a pipers dress uniform to me. However, given that he is wearing buckled shoes with tartan hose and carrying a broad sword my bet is that he was a dancer. On joining a highland regiment every soldier had to learn the pipes, the drums or highland dancing.
After a quick scout around the net I came up with these sites which may well help you track him down.