I researched the example we have in the collection here in York, England. It was donated from the stores of a local Yeomanry unit in 1960. I found no evidence proving issue or use of the type in the 2WW. I know of no photos and interviews with veterans got blank looks. It appears of buff pixie suits were sufficient for the winter of 1944/45.
In British use I have seen post war photos and there is a rumour of one in an IWM Korean War photo.
They may have been supplied to allies post war. Brian L Davies when mentioning them in his 1970'2s book on British 2WW uniforms stated they were supplied post war to Argentina.
I too recall a batch on the market in the early 1980's. This was the time the 'bean counters' were assessing all UK MoD property for potential rationalisation/sell off.