these are issued military surplus. they will show signs of use and wear, such as missing a button or very light stains. we sorted out the worst offenders. they may also be starched as that was the standard for utility uniforms at the time. 

To clean starched pants without shrinking them, turn the pants inside out and wash them in a cold water gentle cycle using mild detergent. Air dry them on a drying rack or clothesline. Avoid hot water and high-heat tumble drying, as heat causes cotton fibers to warp and shrink