RAF re enactors await the call under the wing of a Spitfire
Left: Wearing a 40/41 pattern flying suit, possibly even a 1930 patt - a variation of the pre-war Sidcot suit, 1932 Patt. Mae West, 1943 Patt (Escape) boots (look carefully - you'll see the top strap is not across the front as per 36 Patt boots).
Right: Standard Officers service dress cap, 32 patt. Mae West, lobes painted yellow to aid visibilty - a common practice until the all yellow 1941 patt Mae West, 1939 pattern boots (second version - leather top strap).
Ops 39-45 R.A.F. Living History Group has a website at http://ops1940.homestead.com/ops1.html
(thanks to skypilot62 for the descriptions)