Cargo Work Trousers
What gives cargo work trousers their name? It’s simply the cargo, or patch pocket on the outside of the thigh on one or both legs. Cargo work trousers are usually loose fitting and the cargo pocket normally has a flap to secure its contents.
Originally designed for use by the British Army in 1938 as part of their combat uniform they have remained as a staple item in the workwear wardrobe ever since.