The style is based on the USA military work uniform which ran from the 1950s to the 1980s. Reproduced here in military grade 100% cotton twill, which is durable and hardwearing, yet breathable and soft once broken in. Tough construction with double chain stitched flat felled seams. Unlike the original work uniform, this style has a tapered leg which narrows down to a 15 1/2" opening.