As a Flt Cdt at RAFC Cranwell, I had an Airman's Pattern greatcoat. Rarely worn, but it was horribly heavy and I loathed the wretched thing. Fortunately I handed it back to stores when I went to university as an APO; whilst there, Officers' greatcoats were removed from the scale of issue for officers.
As for the flasher's mac, someone stole mine at College Hall in 1974. But as aircrew I usually drove everywhere when it was raining, or wore a cold weather jacket, so didn't really miss it.