I had a 50+ OTRE beret with proper gold wire badge. Only recently sold it on flee bay.
As the RAF has only the three badges RAFA decided on a forage cap with a uni-rank badge.
http://www.ebay.co.uk/itm/Vintage-19...-/292243999626
The gent above is wearing a modern forage cap with hi dome stay bright buttons.
Here is the real deal:
RAF WW 2 Officers Side Cap/Hat | eBay