RAF OA's patrol dress

Recently purchased a book on Sergeant pilots during th BoB, and came across a uniform I had not seen pictures of before, but had sort of known must have existed. In both pics the chaps wearing it is quite obviously just finished getting married, due to the white clad ladies next to them, and both are dated interwar. I describe it as patrol dress, as it resembles army patrol dress in pocket shape and style (as opposed to pocketless army full dress) but I presume in RAF blue. Both are dated 1937, and in both side caps are worn or carried. Rank is gold (I think) and worn on the left sleeve only. A white collar liner is worn, and interestingly collar dogs on a mandarin collar. No belt is worn, and the wings (both are pilots) are clearly gold embroidered.

Anyone ever seen these before and could enlighten me as to when they were introduced? Was it for the coronation? What was they're proper designation?