Painter's pants by American workwear brand "Washington Dee Cee". Judging by the tag, it appears to be from the 1960s, and is made from a light ounce 2×1 denim of 8 ounces. There is a tool pocket on the right, but no hammer loop.
It's a buzzing flasher, with a portrait of Washington named after the brand and a cowboy despite the fact that it's workwear. At the bottom, there is also a statement that if you are dissatisfied (with the product), you can get a refund. The size is written in pencil, but it is unclear if it is an official brand size because there is no tag on the body to indicate the size.
The shape is typical of painter's pants, but the top edge is reinforced with rivets rather than bar tacks.
General purpose snap button. The pattern is also often seen on store brands and other workwear brands.
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