The Grey Civilian Pants is a common clothing item in Apocalypse Rising. It can be purchased in the newspawn screen for free.
It is best used with grey civilian shirt to blend in with the night. It's color is one of the best in the game, along with the Spec Ops Camo, the grey civilian shirt and the Trinity shirts. This is a recommended clothing item if you don't want to pay credits for clothing at the beginning of the game, but still want useful attire.