Thrilled with this purchase: 1980 Bi Swing Back CWU 36 - P Summer Flight Jacket. Made by Centre MFG Co in XL. This is more fitted than my later CWU's & the material is softer. The Bi swing 'action back' allows great movement. Shell and knits are in good shape for their age.
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The above jacket as I say is much trimmer IMO, sleeves included. The polyamide is softer than later models & feels more comfortable on. The Bi swing allows for comfortable arm & shoulder movement, others would probably know but I would guess they might have been more expensive to produce with the extra engineering in the 'action back'. Funny but it reminded me a bit of my ELC RW A2 in fit...which IMHO is a very good thing. .
What size are you? I'll keep an eye out.