Interlocking stitch patterns resist unraveling from repeated friction

Vintage USN Alpaca N1 Deck Jacket World War 2 Era Size 42 Large.

Label is faded and we can't see size, Arm pit to Arm pit is 27 inches laying flat and shoulder to shoulder is 21 which we estimate being a size 42 equivalent to Large but please check all measurements and consider 0.5 inches thickness alpaca lining

Hurricane grade closures withstand sideways rain penetration