so the usual adjustability is nonexistent

This particular jacket would've been worn by a member of the Royal Navy's Commando personnel

The design of US BDU jackets is pretty handy

Vintage Militaria / Dated 1967

5" / X Short - Label suggests a height around "160"cm

Austrian Army Anzug 75 Flight Jacket Olive Drab - Small 88-92 I/II Pilot so the usual adjustability isAt a glance Thick Cotton & Polyester Blend Material Zipper Closure 2 Zipper Waist Pockets & Zipper Sleeve Pocket Velcro Patches Scarce Thermal Cold Weather Built In Lining Elasticated Cuffs & Waistband Classic Austrian Army Olive Drab Colour Chest Size: 46" Suggested Size: Medium Slim Label states chest from 88 92cm Sleeve Length: 24" Short Austrian I II Collar to Hem: 28. 5" Modern Militaria Dated 2008 Genuine Austrian Armed Forces Bundesheer Surplus