This hat needs Jock'd.

[Bruce Scott]

just enlarged photo....looks like a sergeants mess photo, all are ncos .....with the exception of the soldier with the crown on his sleeve a warrant officer !!!.
the one sporting the sporran would be a pipe major possibly.......I must admit the TAM O SHANTERS that they have on are typical of the period...dinner plates compared to the modern Issued ones.

Aren't the four inverted chevrons on the lower sleeve the insignia of either a Pipe or Drum Major? The fellow in the photo also has something above the stripes on his right sleeve which could be either a drum or bagpipes (far too indistinct for my eyes).

Some also have wound stripes on the lower left sleeve.
http://www.photodetective.co.uk/Wound-Stripe.html