Apparently the dress code is "standard" (colonial?) golf club dress. I'm a member of a couple of London private members' clubs and I've never read anything quite so absurd. I'll post a photo of the instructions we received, and another of how we dressed! Our fellow guests were done up in all manner of strange adaptations to the rules, really a motley crew (what we would describe in Dutch as "een bont gezelschap").
But it was a great lunch, wonderful view, sea breeze and a golf buggy tour of the course before the boat trip back to Hamilton Island. Two courses, glass of (mediocre) wine, transfers all inclusive A$65 per head. Well worth it.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.