Is the bonnet a Mackie? Might well have been.
The cap-badge is that classic style that's been made throughout the 20th century by dozens of different jewellers, endlessly re-cast so it seems.
I do wonder who did the original sculpts, and when.
Here's various iterations of that style from various time-periods. Some of the re-casts have had one or more of the grommets removed, but when present they have a tell-tale arrangement. Also quite distinctive are the buckle and the chape.
BTW in the photo of the younger William MacDonald his belt-plate is the style seen in at least one early 20th century catalogue.
Here it is, number 0102
I used to own a set of that pattern, and eventually picked up the matching plaid brooch on Ebay. There was a matching sporran cantle too, which did once come up on Ebay but was too pricey for me.
Though almost certainly a civilian pattern, at some point it was adopted for the Pipe Major of the Royal Scots Greys (later Royal Scots Dragoon Guards)
Oddly, the mannequin-displayed uniform of the Major of the 4th Battalion Seaforth Highlanders has the Sam Browne belt on back-to-front.
Here's how it would have been worn
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