I've been mulling over the same thing...after watching last weeks installment of Monarch of the Glen and taking note of the outfit that Golly was wearing for a job interview, I had to think that his jacket, which was in tweed, bore a resemblance to what we in the US would call and "Ike" jacket (after the President and General Dwight David Eisenhower). Thought that there might be some promise in looking in for things using that as a sort of "keyword". I would assume that there would have been/still are things like that made in a suitably tropical material.

I've seen a couple of threads that dealt with re-tailoring existing jackets to go with kilts...I suggested in one that I had seen some lighter weight jackets sold as "seperates" at a Target store here and that they would probably be easier to re-configure owing to their lighter weight. Don't know if there's Target over there on the other side of the world but all of this stuff is being made in the Far East (hell, you're closer to the manufacturer than I am!) anyway (except for the stuff that has the label "made in Slovenia"...and as we all know: nothing says "quality" like "made in Slovenia"). I've got to assume that lighter weight suits are the norm due to the climate so I'd think that you might have better luck re-engineering a nice light weight jacket rather than try to find one "off the rack".

best

Auld Argonian

...and, I'll tell you, we decided to forgo the "monkey suits" when I got hitched and I went out an spent the money on a nice Valentino suit...one of the best decisions that we made!