Tagged size isnt present but this pair fits like a generic'small'' - They measure a W30'' (15'' across band) and can be lout out to a 32'' with the button bands -with a inside leg of 30''. The rise is very high, So id say they fit more like a inside leg of 32'' if that makes sense. Im wearing a pair in a 32'' in the video to give a idea of fit - Im five foot 9'' for refrence, but just to get a idea of leg width and styling. For more accurate measurements, Like rise, thigh, or seat etc, see photo's. Okay vintage - one patch of lighter'wear' / markings on one thigh as shown, along with one tiny hole near a trouser leg hem.
Seems to be a rare piece. I know a'Little' about military surplus and have never encountered a pair of these before - And good luck trying to find another!