Hiya, the WRAC evolved from the wartime ATS and was formed in 1949. I myself became a member of it in the 1980's.
Prior to the introduction of the new 1951 pattern BD blouse, the old wartime patterns were still worn.
The new blouse featured an open collar design. But the basic design went back to the early wartime ATS BD, with pleated breast pockets and a fly front.
The blouse is named and numbered to "Kissack W447863"..
This example is a very late issue being dated 1965.