Paint it Blue

Female and male construction workers brushing on lashings of blue paint onto an iron girder. Just a peek at a fragment of China's massively relentless construction boom of which women do play a sizeable part.

If one observes the revolutionary posters from the early days of communism in China women were frequently seen climbing telegraph poles and the like clad in utterly shapeless overalls. However, as the revolution progressed the themes of the posters may have remained very similar but women's clothes became much more tight fitting and flattering in a way that show's off a lady's figure. So, if your ever offered one of these propaganda posters now you'll be able to roughly date it by the clothes.

PS. Notice the modified yellow hard hats!