Original 1980's Vintage army pants.  

These jungle trousers were produced in the 1980's. They are very similar to the Vietnam era issue trousers but with a few small changes. The material used in this postwar variant is slightly different but otherwise there is not too much difference.

The fly, belt loops and waist adjusting straps are all equipped with buttons. For utility the trousers have 2 deep waist pockets, 2 buttoned cargo pockets and 2 rear open topped pockets with a single button closure. The groin and knee areas lack any reinforcing in favour of keeping the pants lighter for use in hot jungle environments.  

Sizing
Kids Size 8-14 (Zip Fly)
Adult Sizing in waist size in inches