No doubt in my mind that it must have been fairly common for RCAF personell to wear the brass crowns in the UK. But saw this item on Ebay and I believe that this AG battledress does show an example conforming to RCAF regs. If you notice the fabric crowns are on an RAF War Service Dress, later war and with Canada overseas titles. The rig looks righteous to me. Thought you might find it interesting.