This is a workwear brand "DUBBLEWARE" coverall from the 1950s. It seems that there is no such thing. Many of the brand's items have a slightly different design, but the one we're going to show you here is There are no changes in the basic shape, but the lack of triple stitching and the shape of the cuffs etc. are different from the typical workwear brands.
Most post-war coveralls have four pockets, but this one has three pockets and the workwear colors are It is weaker and gives the impression of a casual jacket. The silhouette is a box silhouette that goes straight down from the sides to the bottom.
If it's a post-war coverall, the stitching curve on the back is usually triple stitched, or this The first one is sewn with double stitching. This is one of the points where the workwear color is weak.
Extremely simple construction with no buttons attached. When I got it, I thought the cuffs had been cut and customized, but (1) the sleeve length is adequate. length, (2) the stitching on the ends of the sleeves is as faded as the rest of the sleeve, and (3) The fact that the other coveralls of the same brand that I own do not have buttons on them. I believe it was originally designed this way.