As to wearing Red Sea Rig, I used this in the Far East and when attending events with naval friends - some of our light blue chaps were wearing this anyway 'cause they were 'embarked' with the RN.
I first bought a pair of lightweight trousers - self supporting of course and no braces!!! The cummerbund came from my tropical mess kit and a white short sleeve shirt came initially from the RN stores system and later from a local tailor and made to measure. The shoulder boards also came from my No: 8. It looked pretty smart and given that I was in a minority with our RN cousins, it attracted comment from the grownups and a welcome interest from the female guests.
Old Duffer