During World War 2, women engaged in wartime work could choose from a variety of sewing patterns for work wear. The array of coveralls available included the mechanic suit, a close cousin to the siren suit or air raid suit (see my earlier post here). This 1942 pattern from Simplicity shows a khaki version paired with a garrison cap:
(You can see a contemporary photo of View 1 at Unsung Sewing Patterns.)
Happy Labour Day, everyone!
PatternVault 
I’m considering making a pair of coveralls as part of a sew along. My pattern is McCall’s 8520. It was printed post WWII as more of a recreational option for women.