Not only use by pilot, it also is Great for working on cars or trucks.
Information from online:
CWU-66/P Coverall Aircrew, Chemical Protective, Fire Resistant.
These are new & still sealed in package.
Zippered front opening, Velcro name tag, 2 zippered chest pockets, 1 zippered sleeve pocket with 2 pencil/pen holders, 1 zippered leg pocket with 2 pencil/pen holders, adjustable Velcro waist strap, Velcro adjustable sleeves and Velcro and zippered legs.