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He was 5'7", as most pursuit guys had to 'fit' in the cockpit. There were exceptions of course like R.T. Smith who was 6'4" ish, but then the P-40 was reasonably roomy. The tall guys were usually sent over to fly bombers.
My ELC 1729 is a size 46. The collar is noticeably shallower than the GW's, perhaps because it wasn't scaled up from the (presumably smallish) original.