Shirt:
Shirt’s cut is identical to the earlier standard issue US OG-107 sateen utility fatigues (Samples 1 and 2 on that page), except in a khaki tan twill material. A similar jacket was once available for sale here: https://communitythriftandvintage.com/products/vintage-olive-cotton-canvas-jacket.
Stamp:
Contract string is “DA 92-557-FEC-14297”. “FEC” likely indicates it is related to the US Army’s Far East Command. Contract numbers with “FEC” and a similar format were issued to various Japanese organizations during the late 1950s to the early 1960’s for things as varied as labor on bases and scientific research [1]. The “DA” contract prefix was used from 1953 – 1961 [2].
Collar and Shoulder:
Cuffs:
Inside:
Cuffs:
No buttons on cuffs.
Buttons:
US style bakelite (?) button.