Jules,
I have a set of tunic buttons that were given to me by Squadron Leader Joce Millard a few years ago.
He told me that it was fashionable at the time to swap buttons with airmen serving in the RAF from other countries.
The French button was given to him by either Georges Perrin or Rene Mouchotte (he couldn’t recall which one for certain) the Polish button was given to him by Gorzula. (Whilst all were with 615 Squadron).