Either of the Andrews will have a better idea Ethan but IIRC Irvins were stopped being issued to Fighter Command aircrew around '43, although by the looks of 2TAF squadrons during the cold winter of '44/'45 they were still able to be "wangled" by fighter squadrons, though this seems to have been more for "on the ground" warmth rather than flying duties.
They seemed to disappear fairly quickly after the war although I have seen the odd photo of individuals wearing them in some photos from the late '40s/very early '50s.
Like I said though our resident Irvin gurus will be able to give more precise info.
They seemed to disappear fairly quickly after the war although I have seen the odd photo of individuals wearing them in some photos from the late '40s/very early '50s.
Like I said though our resident Irvin gurus will be able to give more precise info.