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What's interesting is that after the Battle of France, fighter boys very seldom wore Irvins whilst flying. They were almost exclusively reserved for being worn on the ground for warmth by that stage.
For example, the winter of '44/'45 was very cold on the Continent and the RAF issued Irvins to fighter squadrons based there purely for wearing on the ground to keep warm on the rudimentary bases the 2 TAF were flying from.
Sergeant Lincoln Orville Lynch DFM, a West Indian air gunner serving with No. 102 Squadron, by the rear turret of his Halifax at RAF Pocklington, February 1944