Sample 1:

overall-denim-battledress-outside  pink-paint-cuff pink-paint-elbow tag

Buttons removable by perpendicular pin on inside.  Pinkish paint on sleeves by right cuff and elbow.


Sample 2: 

1_denimBD belt bottomhooks collar maintag poketbutton tag

More well-worn than Sample 1.  Neck closure hooks moved to base of button opening to keep bottom closed.  Belt has velcro added to keep belt against body when worn.  Original buttons replaced by sew-on buttons, likely of surplus origin, likely by a civilian tailor.